diff --git a/.github/workflows/ci.yaml b/.github/workflows/ci.yaml
index 844cc16..7b915ce 100644
--- a/.github/workflows/ci.yaml
+++ b/.github/workflows/ci.yaml
@@ -13,9 +13,11 @@ jobs:
         run: |
           export DEBIAN_FRONTEND=noninteractive
           apt-get update
+          apt install -y pkg-config
           apt install -y clang
           apt install -y cmake extra-cmake-modules gettext libfmt-dev
           apt install -y fcitx5 libfcitx5core-dev libfcitx5config-dev libfcitx5utils-dev
+          apt install -y libjson-c-dev
       - name: Build
         run: |
           mkdir -p build
@@ -42,10 +44,11 @@ jobs:
         run: |
           export DEBIAN_FRONTEND=noninteractive
           apt-get update
+          apt install -y pkg-config
           apt install -y clang
           apt install -y cmake extra-cmake-modules gettext libfmt-dev
           apt install -y fcitx5 libfcitx5core-dev libfcitx5config-dev libfcitx5utils-dev
-          apt install -y libicu-dev
+          apt install -y libicu-dev libjson-c-dev
       - name: Build
         run: |
           mkdir -p build
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 76a213e..0b7d3f7 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -4,11 +4,14 @@ project(fcitx5-mcbopomofo VERSION 2.5.2)
 find_package(ECM REQUIRED 1.0.0)
 set(CMAKE_MODULE_PATH ${ECM_MODULE_PATH} "${CMAKE_CURRENT_SOURCE_DIR}/cmake" ${CMAKE_MODULE_PATH})
 
+find_package(PkgConfig REQUIRED)
 find_package(Fcitx5Core REQUIRED)
 find_package(Fcitx5Utils REQUIRED)
 find_package(fmt REQUIRED)
 find_package(Gettext REQUIRED)
 
+pkg_check_modules(JSONC REQUIRED IMPORTED_TARGET "json-c")
+
 include(FeatureSummary)
 include(GNUInstallDirs)
 include(ECMSetupVersion)
@@ -58,9 +61,11 @@ message(STATUS "CMAKE_INSTALL_DATADIR ${CMAKE_INSTALL_DATADIR}")
 configure_file(data/data.txt mcbopomofo-data.txt)
 configure_file(data/data-plain-bpmf.txt mcbopomofo-data-plain-bpmf.txt)
 configure_file(data/add-phrase-hook.sh mcbopomofo-add-phrase-hook.sh)
+configure_file(data/dictionary_service.json mcbopomofo-dictionary-service.json)
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/mcbopomofo-data.txt" DESTINATION "${FCITX_INSTALL_PKGDATADIR}/data")
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/mcbopomofo-data-plain-bpmf.txt" DESTINATION "${FCITX_INSTALL_PKGDATADIR}/data")
 install(FILES "${CMAKE_CURRENT_BINARY_DIR}/mcbopomofo-add-phrase-hook.sh" DESTINATION "${FCITX_INSTALL_PKGDATADIR}/data")
+install(FILES "${CMAKE_CURRENT_BINARY_DIR}/mcbopomofo-dictionary-service.json" DESTINATION "${FCITX_INSTALL_PKGDATADIR}/data")
 
 fcitx5_translate_desktop_file(org.fcitx.Fcitx5.Addon.McBopomofo.metainfo.xml.in
                               org.fcitx.Fcitx5.Addon.McBopomofo.metainfo.xml XML
diff --git a/README.md b/README.md
index 1d601a9..1056a61 100644
--- a/README.md
+++ b/README.md
@@ -31,8 +31,8 @@
 
 ```bash
 sudo apt install \
-    fcitx5 libfcitx5core-dev libfcitx5config-dev libfcitx5utils-dev \
-    cmake extra-cmake-modules gettext libfmt-dev libicu-dev
+    pkg-config fcitx5 libfcitx5core-dev libfcitx5config-dev libfcitx5utils-dev \
+    cmake extra-cmake-modules gettext libfmt-dev libicu-dev libjson-c-dev
 ```
 
 然後在本專案的 git 目錄下執行以下指令：
diff --git a/build.sh b/build.sh
index 8cd08f1..27fad38 100644
--- a/build.sh
+++ b/build.sh
@@ -1,7 +1,7 @@
 #!/bin/sh
 
-rm -rf build
-mkdir -p build
+# rm -rf build
+# mkdir -p build
 cd build
 cmake .. -DCMAKE_INSTALL_PREFIX=/usr -DCMAKE_BUILD_TYPE=Debug # use Debug for easy debugging with gdb
 make                                                          # or ninja, depending on your system
diff --git a/data/dictionary_service.json b/data/dictionary_service.json
new file mode 100644
index 0000000..1c1b41f
--- /dev/null
+++ b/data/dictionary_service.json
@@ -0,0 +1,56 @@
+{
+  "services": [
+    {
+      "name": "萌典",
+      "url_template": "https://www.moedict.tw/(encoded)"
+    },
+    {
+      "name": "萌典 (台語)",
+      "url_template": "https://www.moedict.tw/'(encoded)"
+    },
+    {
+      "name": "萌典 (客語)",
+      "url_template": "https://www.moedict.tw/:(encoded)"
+    },
+    {
+      "name": "Google",
+      "url_template": "https://www.google.com/search?q=(encoded)"
+    },
+    {
+      "name": "教育部重編國語詞典修訂本",
+      "url_template": "https://dict.revised.moe.edu.tw/search.jsp?md=1&word=(encoded)"
+    },
+    {
+      "name": "教育部國語詞典簡編本",
+      "url_template": "https://dict.concised.moe.edu.tw/search.jsp?md=1&word=(encoded)"
+    },
+    {
+      "name": "教育部成語典",
+      "url_template": "https://dict.idioms.moe.edu.tw/idiomList.jsp?idiom=(encoded)&qMd=0&qTp=1&qTp=2"
+    },
+    {
+      "name": "教育部異體字字典",
+      "url_template": "https://dict.variants.moe.edu.tw/variants/rbt/query_result.do?from=standard&search_text=(encoded)"
+    },
+    {
+      "name": "教育部國字標準字體筆順學習網",
+      "url_template": "https://stroke-order.learningweb.moe.edu.tw/charactersQueryResult.do?words=(encoded)&lang=zh_TW&csrfPreventionSalt=null"
+    },
+    {
+      "name": "教育部臺灣閩南語常用詞辭典",
+      "url_template": "https://sutian.moe.edu.tw/zh-hant/tshiau/?lui=tai_su&tsha=(encoded)"
+    },
+    {
+      "name": "Wiktionary",
+      "url_template": "https://zh.wiktionary.org/wiki/Special:Search?search=(encoded)"
+    },
+    {
+      "name": "康熙字典網上版",
+      "url_template": "https://www.kangxizidian.com/search/index.php?stype=Word&sword=(encoded)&detail=n"
+    },
+    {
+      "name": "Unihan Database",
+      "url_template": "https://www.unicode.org/cgi-bin/GetUnihanData.pl?codepoint=(encoded)"
+    }
+  ]
+}
diff --git a/po/en.po b/po/en.po
index 8ef1971..a261951 100644
--- a/po/en.po
+++ b/po/en.po
@@ -7,7 +7,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: fcitx5-mcbopomofo v0.1\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2022-12-30 10:34+0800\n"
+"POT-Creation-Date: 2023-12-31 21:14+0800\n"
 "PO-Revision-Date: 2022-03-22 20:28-0700\n"
 "Last-Translator: Automatically generated\n"
 "Language-Team: none\n"
@@ -17,83 +17,91 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "Plural-Forms: nplurals=2; plural=(n != 1);\n"
 
-#: src/McBopomofo.cpp:129
+#: src/McBopomofo.cpp:164
 msgid "Cursor is between syllables {0} and {1}"
 msgstr ""
 
-#: src/McBopomofo.cpp:134
+#: src/McBopomofo.cpp:169
 msgid "{0} syllables required"
 msgstr ""
 
-#: src/McBopomofo.cpp:138
+#: src/McBopomofo.cpp:173
 msgid "{0} syllables maximum"
 msgstr ""
 
-#: src/McBopomofo.cpp:142
+#: src/McBopomofo.cpp:177
 msgid "phrase already exists"
 msgstr ""
 
-#: src/McBopomofo.cpp:146
+#: src/McBopomofo.cpp:181
 msgid "press Enter to add the phrase"
 msgstr ""
 
-#: src/McBopomofo.cpp:152
+#: src/McBopomofo.cpp:187
 msgid "Marked: {0}, syllables: {1}, {2}"
 msgstr ""
 
-#: src/McBopomofo.cpp:164
+#: src/McBopomofo.cpp:199
 msgid "# Custom Phrases or Characters."
 msgstr ""
 
-#: src/McBopomofo.cpp:166
+#: src/McBopomofo.cpp:201
 msgid ""
 "# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動加詞 for "
 "usage."
 msgstr ""
 
-#: src/McBopomofo.cpp:168
+#: src/McBopomofo.cpp:203
 msgid ""
 "# Add your phrases and their respective Bopomofo reading below. Use hyphen "
 "(\"-\")"
 msgstr ""
 
-#: src/McBopomofo.cpp:169
+#: src/McBopomofo.cpp:204
 msgid "# to connect the Bopomofo syllables."
 msgstr ""
 
-#: src/McBopomofo.cpp:173 src/McBopomofo.cpp:192
+#: src/McBopomofo.cpp:208 src/McBopomofo.cpp:227
 msgid "# Any line that starts with \"#\" is treated as comment."
 msgstr ""
 
-#: src/McBopomofo.cpp:182
+#: src/McBopomofo.cpp:217
 msgid "# Custom Excluded Phrases or Characters."
 msgstr ""
 
-#: src/McBopomofo.cpp:184
+#: src/McBopomofo.cpp:219
 msgid ""
 "# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動刪詞 for "
 "usage."
 msgstr ""
 
-#: src/McBopomofo.cpp:186
+#: src/McBopomofo.cpp:221
 msgid ""
 "# For example, the line below will prevent the phrase \"家祠\" from showing "
 "up anywhere:"
 msgstr ""
 
-#: src/McBopomofo.cpp:190
+#: src/McBopomofo.cpp:225
 msgid ""
 "# Note that you need to use a hyphen (\"-\") between Bopomofo syllables."
 msgstr ""
 
-#: src/McBopomofo.cpp:231
+#: src/McBopomofo.cpp:266
 msgid "Edit User Phrases"
 msgstr ""
 
-#: src/McBopomofo.cpp:241
+#: src/McBopomofo.cpp:276
 msgid "Edit Excluded Phrases"
 msgstr ""
 
+#: src/McBopomofo.cpp:876
+msgid "UTF8 String Length: {0}"
+msgstr ""
+
+#: src/McBopomofo.cpp:879
+msgid "Code Point Count: {0}"
+msgstr ""
+
 #: src/McBopomofo.h:59
 msgid "standard"
 msgstr "Standard"
@@ -172,15 +180,15 @@ msgstr "Input HTML Ruby Text"
 
 #: src/McBopomofo.h:98
 msgid "Bopomofo Keyboard Layout"
-msgstr ""
+msgstr "Bopomofo Keyboard Layout"
 
 #: src/McBopomofo.h:104
 msgid "Candidate List Layout"
-msgstr ""
+msgstr "Candidate List Layout"
 
 #: src/McBopomofo.h:109
 msgid "Selection Keys"
-msgstr ""
+msgstr "Selection Keys"
 
 #: src/McBopomofo.h:114
 msgid "Show Candidate Phrase"
@@ -188,30 +196,38 @@ msgstr "Show Candidates"
 
 #: src/McBopomofo.h:119
 msgid "Move cursor after selection"
-msgstr ""
+msgstr "Move cursor after selection"
 
 #: src/McBopomofo.h:125
 msgid "ESC key clears entire composing buffer"
-msgstr ""
+msgstr "ESC key clears entire composing buffer"
 
 #: src/McBopomofo.h:129
 msgid "Shift + Letter Keys"
-msgstr ""
+msgstr "Shift + Letter Keys"
 
 #: src/McBopomofo.h:135
 msgid "Control + Enter Key"
-msgstr ""
+msgstr "Control + Enter Key"
 
 #: src/McBopomofo.h:140
 msgid "Open User Phrase Files With"
-msgstr ""
+msgstr "Open User Phrase Files With"
 
 #: src/McBopomofo.h:145
 msgid "Add Phrase Hook Path"
-msgstr ""
+msgstr "Add Phrase Hook Path"
 
 #: src/McBopomofo.h:150
 msgid "Run the hook script after adding a phrase"
+msgstr "Run the hook script after adding a phrase"
+
+#: src/DictionaryService.cpp:37 src/DictionaryService.cpp:55
+msgid "Character Information"
+msgstr ""
+
+#: src/DictionaryService.cpp:76
+msgid "Look up \"{0}\" in {1}"
 msgstr ""
 
 #: src/mcbopomofo.conf.in.in:3 src/mcbopomofo-addon.conf.in.in:3
@@ -225,13 +241,16 @@ msgstr "Plain Bopomofo"
 
 #: src/mcbopomofo-addon.conf.in.in:4
 msgid "McBopomofo Input Method For Fcitx"
-msgstr ""
+msgstr "McBopomofo Input Method For Fcitx"
 
 #: org.fcitx.Fcitx5.Addon.McBopomofo.metainfo.xml.in:7
 #, fuzzy
 msgid "McBopomofo for Fcitx 5"
-msgstr "Plain Bopomofo"
+msgstr "McBopomofo for Fcitx 5"
 
 #: org.fcitx.Fcitx5.Addon.McBopomofo.metainfo.xml.in:8
 msgid "A Bopomofo input method that picks phrases intelligently"
-msgstr ""
+msgstr "A Bopomofo input method that picks phrases intelligently"
+
+#~ msgid "Open URL With"
+#~ msgstr "Open URL With"
diff --git a/po/fcitx5-mcbopomofo.pot b/po/fcitx5-mcbopomofo.pot
index 374ac4f..2e11979 100644
--- a/po/fcitx5-mcbopomofo.pot
+++ b/po/fcitx5-mcbopomofo.pot
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: fcitx5-mcbopomofo\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2022-12-30 10:34+0800\n"
+"POT-Creation-Date: 2023-12-31 21:14+0800\n"
 "PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
 "Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
 "Language-Team: LANGUAGE <LL@li.org>\n"
@@ -17,83 +17,91 @@ msgstr ""
 "Content-Type: text/plain; charset=UTF-8\n"
 "Content-Transfer-Encoding: 8bit\n"
 
-#: src/McBopomofo.cpp:129
+#: src/McBopomofo.cpp:164
 msgid "Cursor is between syllables {0} and {1}"
 msgstr ""
 
-#: src/McBopomofo.cpp:134
+#: src/McBopomofo.cpp:169
 msgid "{0} syllables required"
 msgstr ""
 
-#: src/McBopomofo.cpp:138
+#: src/McBopomofo.cpp:173
 msgid "{0} syllables maximum"
 msgstr ""
 
-#: src/McBopomofo.cpp:142
+#: src/McBopomofo.cpp:177
 msgid "phrase already exists"
 msgstr ""
 
-#: src/McBopomofo.cpp:146
+#: src/McBopomofo.cpp:181
 msgid "press Enter to add the phrase"
 msgstr ""
 
-#: src/McBopomofo.cpp:152
+#: src/McBopomofo.cpp:187
 msgid "Marked: {0}, syllables: {1}, {2}"
 msgstr ""
 
-#: src/McBopomofo.cpp:164
+#: src/McBopomofo.cpp:199
 msgid "# Custom Phrases or Characters."
 msgstr ""
 
-#: src/McBopomofo.cpp:166
+#: src/McBopomofo.cpp:201
 msgid ""
 "# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動加詞 for "
 "usage."
 msgstr ""
 
-#: src/McBopomofo.cpp:168
+#: src/McBopomofo.cpp:203
 msgid ""
 "# Add your phrases and their respective Bopomofo reading below. Use hyphen "
 "(\"-\")"
 msgstr ""
 
-#: src/McBopomofo.cpp:169
+#: src/McBopomofo.cpp:204
 msgid "# to connect the Bopomofo syllables."
 msgstr ""
 
-#: src/McBopomofo.cpp:173 src/McBopomofo.cpp:192
+#: src/McBopomofo.cpp:208 src/McBopomofo.cpp:227
 msgid "# Any line that starts with \"#\" is treated as comment."
 msgstr ""
 
-#: src/McBopomofo.cpp:182
+#: src/McBopomofo.cpp:217
 msgid "# Custom Excluded Phrases or Characters."
 msgstr ""
 
-#: src/McBopomofo.cpp:184
+#: src/McBopomofo.cpp:219
 msgid ""
 "# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動刪詞 for "
 "usage."
 msgstr ""
 
-#: src/McBopomofo.cpp:186
+#: src/McBopomofo.cpp:221
 msgid ""
 "# For example, the line below will prevent the phrase \"家祠\" from showing "
 "up anywhere:"
 msgstr ""
 
-#: src/McBopomofo.cpp:190
+#: src/McBopomofo.cpp:225
 msgid ""
 "# Note that you need to use a hyphen (\"-\") between Bopomofo syllables."
 msgstr ""
 
-#: src/McBopomofo.cpp:231
+#: src/McBopomofo.cpp:266
 msgid "Edit User Phrases"
 msgstr ""
 
-#: src/McBopomofo.cpp:241
+#: src/McBopomofo.cpp:276
 msgid "Edit Excluded Phrases"
 msgstr ""
 
+#: src/McBopomofo.cpp:876
+msgid "UTF8 String Length: {0}"
+msgstr ""
+
+#: src/McBopomofo.cpp:879
+msgid "Code Point Count: {0}"
+msgstr ""
+
 #: src/McBopomofo.h:59
 msgid "standard"
 msgstr ""
@@ -214,6 +222,14 @@ msgstr ""
 msgid "Run the hook script after adding a phrase"
 msgstr ""
 
+#: src/DictionaryService.cpp:37 src/DictionaryService.cpp:55
+msgid "Character Information"
+msgstr ""
+
+#: src/DictionaryService.cpp:76
+msgid "Look up \"{0}\" in {1}"
+msgstr ""
+
 #: src/mcbopomofo.conf.in.in:3 src/mcbopomofo-addon.conf.in.in:3
 msgid "McBopomofo"
 msgstr ""
diff --git a/po/zh_TW.po b/po/zh_TW.po
index 48ffa77..c517dc7 100644
--- a/po/zh_TW.po
+++ b/po/zh_TW.po
@@ -8,7 +8,7 @@ msgid ""
 msgstr ""
 "Project-Id-Version: fcitx5-mcbopomofo v0.1\n"
 "Report-Msgid-Bugs-To: \n"
-"POT-Creation-Date: 2022-12-30 10:34+0800\n"
+"POT-Creation-Date: 2023-12-31 21:14+0800\n"
 "PO-Revision-Date: 2022-12-28 21:39+0800\n"
 "Last-Translator: Chaoting Liu <brli@chakralinux.org>\n"
 "Language-Team: none\n"
@@ -18,85 +18,98 @@ msgstr ""
 "Content-Transfer-Encoding: 8bit\n"
 "X-Generator: Poedit 3.2.2\n"
 
-#: src/McBopomofo.cpp:129
+#: src/McBopomofo.cpp:164
 msgid "Cursor is between syllables {0} and {1}"
 msgstr "游標在「{0}」與「{1}」之間"
 
-#: src/McBopomofo.cpp:134
+#: src/McBopomofo.cpp:169
 msgid "{0} syllables required"
 msgstr "至少需要選取{0}個字"
 
-#: src/McBopomofo.cpp:138
+#: src/McBopomofo.cpp:173
 msgid "{0} syllables maximum"
 msgstr "最多只能選取{0}個字"
 
-#: src/McBopomofo.cpp:142
+#: src/McBopomofo.cpp:177
 msgid "phrase already exists"
 msgstr "詞庫已經有這個詞"
 
-#: src/McBopomofo.cpp:146
+#: src/McBopomofo.cpp:181
 msgid "press Enter to add the phrase"
 msgstr "請按 Enter 加入自訂詞庫"
 
-#: src/McBopomofo.cpp:152
+#: src/McBopomofo.cpp:187
 msgid "Marked: {0}, syllables: {1}, {2}"
 msgstr "選取了「{0}」，注音「{1}」：{2}"
 
-#: src/McBopomofo.cpp:164
+#: src/McBopomofo.cpp:199
 msgid "# Custom Phrases or Characters."
 msgstr "# 手動加詞資料檔"
 
-#: src/McBopomofo.cpp:166
+#: src/McBopomofo.cpp:201
 msgid ""
-"# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動加詞 for usage."
+"# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動加詞 for "
+"usage."
 msgstr ""
-"# 使用方式請參考 https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動加詞"
+"# 使用方式請參考 https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動"
+"加詞"
 
-#: src/McBopomofo.cpp:168
+#: src/McBopomofo.cpp:203
 msgid ""
 "# Add your phrases and their respective Bopomofo reading below. Use hyphen "
 "(\"-\")"
 msgstr ""
 "# 請在下方加入用戶自訂字詞。每個詞後面要有字詞的讀音。注音音節之間要用減"
 
-#: src/McBopomofo.cpp:169
+#: src/McBopomofo.cpp:204
 msgid "# to connect the Bopomofo syllables."
 msgstr "# 號 (\"-\") 分隔。例如，以下範例加入「小麥注音」一詞："
 
-#: src/McBopomofo.cpp:173 src/McBopomofo.cpp:192
+#: src/McBopomofo.cpp:208 src/McBopomofo.cpp:227
 msgid "# Any line that starts with \"#\" is treated as comment."
 msgstr "# 如果任何一行以 \"#\" 開頭，該行將被當作註解忽略。"
 
-#: src/McBopomofo.cpp:182
+#: src/McBopomofo.cpp:217
 msgid "# Custom Excluded Phrases or Characters."
 msgstr "# 手動刪詞資料檔"
 
-#: src/McBopomofo.cpp:184
+#: src/McBopomofo.cpp:219
 msgid ""
-"# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動刪詞 for usage."
+"# See https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動刪詞 for "
+"usage."
 msgstr ""
-"# 使用方式請參考 https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動刪詞"
+"# 使用方式請參考 https://github.com/openvanilla/McBopomofo/wiki/使用手冊#手動"
+"刪詞"
 
-#: src/McBopomofo.cpp:186
+#: src/McBopomofo.cpp:221
 msgid ""
 "# For example, the line below will prevent the phrase \"家祠\" from showing "
 "up anywhere:"
 msgstr ""
-"# 如果將下面這行範例加入資料檔中，輸入 \"ㄐㄧㄚ ㄘˊ\" 時不會再看到「家祠」一詞："
+"# 如果將下面這行範例加入資料檔中，輸入 \"ㄐㄧㄚ ㄘˊ\" 時不會再看到「家祠」一"
+"詞："
 
-#: src/McBopomofo.cpp:190
+#: src/McBopomofo.cpp:225
 msgid ""
 "# Note that you need to use a hyphen (\"-\") between Bopomofo syllables."
 msgstr "# 請注意，注音音節之間要用減號 (\"-\") 分隔。"
 
-#: src/McBopomofo.cpp:231
+#: src/McBopomofo.cpp:266
 msgid "Edit User Phrases"
 msgstr "編輯使用者詞彙"
 
-#: src/McBopomofo.cpp:241
+#: src/McBopomofo.cpp:276
 msgid "Edit Excluded Phrases"
 msgstr "編輯排除的詞彙"
 
+#: src/McBopomofo.cpp:876
+msgid "UTF8 String Length: {0}"
+msgstr "UTF8 字串長度 {0}"
+
+#: src/McBopomofo.cpp:879
+msgid "Code Point Count: {0}"
+msgstr "總字數 {0}"
+
 #: src/McBopomofo.h:59
 msgid "standard"
 msgstr "標準"
@@ -217,6 +230,14 @@ msgstr "加詞腳本路徑"
 msgid "Run the hook script after adding a phrase"
 msgstr "在加入新詞之後執行加詞腳本"
 
+#: src/DictionaryService.cpp:37 src/DictionaryService.cpp:55
+msgid "Character Information"
+msgstr "字元資訊"
+
+#: src/DictionaryService.cpp:76
+msgid "Look up \"{0}\" in {1}"
+msgstr "在{1}尋找「{0}」"
+
 #: src/mcbopomofo.conf.in.in:3 src/mcbopomofo-addon.conf.in.in:3
 msgid "McBopomofo"
 msgstr "小麥注音"
@@ -236,3 +257,6 @@ msgstr "Fctix 5 的小麥注音"
 #: org.fcitx.Fcitx5.Addon.McBopomofo.metainfo.xml.in:8
 msgid "A Bopomofo input method that picks phrases intelligently"
 msgstr "一套智慧選字的注音輸入法"
+
+#~ msgid "Open URL With"
+#~ msgstr "開啟網址連結時要用"
diff --git a/run-xgettext.sh b/run-xgettext.sh
index cd76d0d..940ef38 100644
--- a/run-xgettext.sh
+++ b/run-xgettext.sh
@@ -7,7 +7,7 @@ xgettext \
 	-k_ \
 	-kN_ \
 	-o po/fcitx5-mcbopomofo.pot \
-	src/McBopomofo.cpp src/McBopomofo.h
+	src/McBopomofo.cpp src/McBopomofo.h src/DictionaryService.cpp
 
 xgettext \
 	--package-name=fcitx5-mcbopomofo \
diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index 5f9b466..2b91ab2 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -1,11 +1,17 @@
 cmake_minimum_required(VERSION 3.6)
 project(mcbopomofo VERSION 2.5.2)
 
+find_package(PkgConfig REQUIRED)
 find_package(Fcitx5Core REQUIRED)
 find_package(Fcitx5Utils REQUIRED)
 find_package(fmt REQUIRED)
 find_package(Gettext REQUIRED)
 find_package(ICU COMPONENTS uc i18n REQUIRED)
+
+pkg_check_modules(JSONC REQUIRED IMPORTED_TARGET "json-c")
+include_directories(${JSONC_INCLUDE_DIRS})
+link_directories(${JSONC_LIBRARY_DIRS})
+
 if (CMAKE_VERSION VERSION_GREATER_EQUAL "3.23.0")
     find_package(GTest)
 endif()
@@ -17,7 +23,9 @@ set(MCBOPOMOFO_LIB_SOURCES
  LanguageModelLoader.cpp
  UTF8Helper.cpp
  InputMacro.cpp
- Log.cpp)
+ Log.cpp
+ DictionaryService.cpp
+)
 
 # https://stackoverflow.com/questions/26549137/shared-library-on-linux-and-fpic-error
 set (CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -fPIC")
@@ -27,7 +35,7 @@ include("${FCITX_INSTALL_CMAKECONFIG_DIR}/Fcitx5Utils/Fcitx5CompilerSettings.cma
 
 add_library(McBopomofoLib ${MCBOPOMOFO_LIB_SOURCES})
 target_compile_options(McBopomofoLib PRIVATE -Wno-unknown-pragmas)
-target_link_libraries(McBopomofoLib PRIVATE Fcitx5::Utils ICU::uc ICU::i18n gramambular2_lib McBopomofoLMLib MandarinLib)
+target_link_libraries(McBopomofoLib PRIVATE Fcitx5::Utils ICU::uc ICU::i18n ${JSONC_LIBRARIES} gramambular2_lib McBopomofoLMLib MandarinLib)
 target_include_directories(McBopomofoLib PRIVATE Fcitx5::Utils)
 target_compile_definitions(McBopomofoLib PRIVATE FCITX_GETTEXT_DOMAIN=\"fcitx5-mcbopomofo\")
 
@@ -46,7 +54,7 @@ if (USE_LEGACY_FCITX5_API)
     add_compile_definitions(mcbopomofo USE_LEGACY_FCITX5_API=1)
 endif()
 target_compile_options(mcbopomofo PRIVATE -Wno-unknown-pragmas)
-target_link_libraries(mcbopomofo PRIVATE Fcitx5::Core McBopomofoLib fmt::fmt)
+target_link_libraries(mcbopomofo PRIVATE Fcitx5::Core McBopomofoLib fmt::fmt ${JSONC_LIBRARIES})
 target_include_directories(mcbopomofo PRIVATE Fcitx5::Core fmt::fmt)
 set_target_properties(mcbopomofo PROPERTIES PREFIX "")
 target_compile_definitions(mcbopomofo PRIVATE FCITX_GETTEXT_DOMAIN=\"fcitx5-mcbopomofo\")
@@ -97,8 +105,8 @@ if (ENABLE_TEST)
         add_executable(McBopomofoTest
                 KeyHandlerTest.cpp UTF8HelperTest.cpp)
         target_compile_options(McBopomofoTest PRIVATE -Wno-unknown-pragmas)
-        target_link_libraries(McBopomofoTest PRIVATE Fcitx5::Core GTest::gtest_main GTest::gmock_main McBopomofoLib)
-        target_include_directories(McBopomofoTest PRIVATE Fcitx5::Core)
+        target_link_libraries(McBopomofoTest PRIVATE Fcitx5::Core GTest::gtest_main GTest::gmock_main McBopomofoLib fmt::fmt ${JSONC_LIBRARIES})
+        target_include_directories(McBopomofoTest PRIVATE Fcitx5::Core fmt::fmt)
 
         configure_file(../data/data.txt mcbopomofo-test-data.txt)
 
diff --git a/src/DictionaryService.cpp b/src/DictionaryService.cpp
new file mode 100644
index 0000000..a604a36
--- /dev/null
+++ b/src/DictionaryService.cpp
@@ -0,0 +1,154 @@
+#include "DictionaryService.h"
+
+#include <fcitx-utils/i18n.h>
+#include <fcitx-utils/misc.h>
+#include <fcitx-utils/standardpath.h>
+#include <fmt/format.h>
+#include <json-c/json.h>
+
+#include <iomanip>
+#include <ostream>
+#include <sstream>
+#include <utility>
+
+#include "Log.h"
+
+constexpr char kDataPath[] = "data/mcbopomofo-dictionary-service.json";
+
+std::string urlEncode(const std::string& str) {
+  std::ostringstream encodedStream;
+  encodedStream << std::hex << std::uppercase << std::setfill('0');
+
+  for (char c : str) {
+    if (std::isalnum(c) || c == '-' || c == '_' || c == '.' || c == '~') {
+      encodedStream << c;
+    } else {
+      encodedStream << '%' << std::setw(2)
+                    << static_cast<unsigned int>(static_cast<unsigned char>(c));
+    }
+  }
+
+  return encodedStream.str();
+}
+
+class CharacterInfoService : public McBopomofo::DictionaryService {
+ public:
+  std::string name() const override {
+    return fmt::format(_("Character Information"));
+  }
+
+  void lookup(std::string phrase, McBopomofo::InputState* state,
+              size_t /*Unused*/,
+              const McBopomofo::StateCallback& stateCallback) override {
+    auto selecting =
+        dynamic_cast<McBopomofo::InputStates::SelectingDictionary*>(state);
+    if (selecting != nullptr) {
+      auto copy = selecting->copy();
+      auto newState =
+          std::make_unique<McBopomofo::InputStates::ShowingCharInfo>(
+              std::move(copy), phrase);
+      stateCallback(std::move(newState));
+    }
+  }
+
+  std::string textForMenu(std::string /*Unused*/) const override {
+    return fmt::format(_("Character Information"));
+  }
+};
+
+class HttpBasedDictionaryService : public McBopomofo::DictionaryService {
+ public:
+  HttpBasedDictionaryService(std::string name, std::string urlTemplate)
+      : name_(std::move(name)), urlTemplate_(std::move(urlTemplate)) {}
+  ~HttpBasedDictionaryService() override = default;
+  std::string name() const override { return name_; };
+
+  void lookup(std::string phrase, McBopomofo::InputState* /*unused*/,
+              size_t /*unused*/,
+              const McBopomofo::StateCallback& /*unused*/) override {
+    std::string url = urlTemplate_;
+    std::string encoded = "(encoded)";
+    url.replace(url.find(encoded), url.length(), urlEncode(phrase));
+    fcitx::startProcess({"xdg-open", url});
+  }
+
+  std::string textForMenu(std::string selectedString) const override {
+    return fmt::format(_("Look up \"{0}\" in {1}"), selectedString, name_);
+  }
+
+ private:
+  std::string name_;
+  std::string urlTemplate_;
+};
+
+McBopomofo::DictionaryServices::DictionaryServices() = default;
+
+bool McBopomofo::DictionaryServices::hasServices() {
+  return !services_.empty();
+}
+
+void McBopomofo::DictionaryServices::lookup(
+    std::string phrase, size_t serviceIndex, InputState* state,
+    const StateCallback& stateCallback) {
+  if (serviceIndex >= services_.size()) {
+    return;
+  }
+  auto service = services_[serviceIndex].get();
+  service->lookup(std::move(phrase), state, serviceIndex, stateCallback);
+}
+
+std::vector<std::string> McBopomofo::DictionaryServices::menuForPhrase(
+    const std::string& phrase) {
+  std::vector<std::string> menu;
+  for (const auto& service : services_) {
+    std::string item = service->textForMenu(phrase);
+    menu.emplace_back(item);
+  }
+  return menu;
+}
+
+void McBopomofo::DictionaryServices::load() {
+  services_.emplace_back(std::make_unique<CharacterInfoService>());
+
+  // Load json and add to services_
+  std::string dictionaryServicesPath = fcitx::StandardPath::global().locate(
+      fcitx::StandardPath::Type::PkgData, kDataPath);
+  FILE* file = fopen(dictionaryServicesPath.c_str(), "r");
+  if (!file) {
+    FCITX_MCBOPOMOFO_INFO()
+        << "No dictionary service file" << dictionaryServicesPath;
+    return;
+  }
+  fseek(file, 0, SEEK_END);
+  long file_size = ftell(file);
+  fseek(file, 0, SEEK_SET);
+  std::unique_ptr<char[]> json_data(new char[file_size + 1]);
+  fread(json_data.get(), 1, file_size, file);
+  fclose(file);
+  json_data[file_size] = '\0';
+  struct json_object* json_obj = json_tokener_parse(json_data.get());
+  if (json_obj == nullptr) {
+    return;
+  }
+  struct json_object* servicesArray;
+  if (json_object_object_get_ex(json_obj, "services", &servicesArray)) {
+    array_list* list = json_object_get_array(servicesArray);
+    for (size_t i = 0; i < array_list_length(list); i++) {
+      auto* element = (struct json_object*)array_list_get_idx(list, i);
+      struct json_object* name;
+      struct json_object* url_template;
+      if (json_object_object_get_ex(element, "name", &name) &&
+          json_object_object_get_ex(element, "url_template", &url_template)) {
+        std::string name_str = std::string(json_object_get_string(name));
+        std::string url_template_str =
+            std::string(json_object_get_string(url_template));
+        auto service = std::make_unique<HttpBasedDictionaryService>(
+            name_str, url_template_str);
+        services_.push_back(std::move(service));
+      }
+    }
+  }
+  json_object_put(json_obj);
+}
+
+McBopomofo::DictionaryServices::~DictionaryServices() = default;
diff --git a/src/DictionaryService.h b/src/DictionaryService.h
new file mode 100644
index 0000000..77b53c0
--- /dev/null
+++ b/src/DictionaryService.h
@@ -0,0 +1,60 @@
+
+#ifndef FCITX5_MCBOPOMOFO_DICTIONARYSERVICE_H
+#define FCITX5_MCBOPOMOFO_DICTIONARYSERVICE_H
+
+#include <functional>
+#include <memory>
+#include <string>
+
+#include "InputState.h"
+
+namespace McBopomofo {
+
+using StateCallback =
+    std::function<void(std::unique_ptr<McBopomofo::InputState>)>;
+
+/**
+ * Represents a single dictionary service.
+ */
+class DictionaryService {
+ public:
+  virtual ~DictionaryService() {};
+
+  virtual std::string name() const = 0;
+  virtual void lookup(std::string phrase, InputState* state, size_t serviceIndex,
+                      const StateCallback& stateCallback) = 0;
+  virtual std::string textForMenu(std::string selectedString) const = 0;
+};
+
+/**  Provides dictionaries that helps user to look up phrases. */
+class DictionaryServices {
+ public:
+  DictionaryServices();
+  ~DictionaryServices();
+  /** Whether if there is a list of services. */
+  bool hasServices();
+  /** Load additional services. */
+  void load();
+  /**
+   * Look up a phrase using the index of the service in the list.
+   * @param phrase The phrase.
+   * @param serviceIndex Index of the service.
+   * @param state The current state.
+   * @param stateCallback The state callback.
+   */
+  void lookup(std::string phrase, size_t serviceIndex, InputState* state,
+              const StateCallback& stateCallback);
+  /**
+   * Create a menu by passing the selected phrase.
+   * @param phrase The phrase.
+   * @return The menu.
+   */
+  std::vector<std::string> menuForPhrase(const std::string& phrase);
+
+ protected:
+  std::vector<std::unique_ptr<DictionaryService>> services_;
+};
+
+}  // namespace McBopomofo
+
+#endif  // FCITX5_MCBOPOMOFO_DICTIONARYSERVICE_H
diff --git a/src/InputMacro.cpp b/src/InputMacro.cpp
index 3253ae0..d5ed460 100644
--- a/src/InputMacro.cpp
+++ b/src/InputMacro.cpp
@@ -24,8 +24,8 @@ class InputMacroDate : public InputMacro {
  public:
   InputMacroDate(std::string macroName, std::string calendar, int offset,
                  icu::DateFormat::EStyle style)
-      : name_(macroName),
-        calendarName_(calendar),
+      : name_(std::move(macroName)),
+        calendarName_(std::move(calendar)),
         dayOffset_(offset),
         dateStyle_(style) {}
   std::string name() const override { return name_; }
@@ -43,10 +43,10 @@ class InputMacroDate : public InputMacro {
 class InputMacroYear : public InputMacro {
  public:
   InputMacroYear(std::string macroName, std::string calendar, int offset, icu::UnicodeString pattern)
-      : name_(macroName),
-        calendarName_(calendar),
+      : name_(std::move(macroName)),
+        calendarName_(std::move(calendar)),
         yearOffset_(offset),
-        pattern_(pattern) {}
+        pattern_(std::move(pattern)) {}
   std::string name() const override { return name_; }
   std::string replacement() const override {
     return formatWithPattern(calendarName_, yearOffset_, /*dateOffset*/ 0, pattern_) + "年";
@@ -63,10 +63,10 @@ class InputMacroYear : public InputMacro {
 class InputMacroDayOfTheWeek : public InputMacro {
  public:
   InputMacroDayOfTheWeek(std::string macroName, std::string calendar, int offset, icu::UnicodeString pattern)
-      : name_(macroName),
-        calendarName_(calendar),
+      : name_(std::move(macroName)),
+        calendarName_(std::move(calendar)),
         dayOffset_(offset),
-        pattern_(pattern) {}
+        pattern_(std::move(pattern)) {}
   std::string name() const override { return name_; }
   std::string replacement() const override {
     return formatWithPattern(calendarName_, /*yearOffset*/ 0, dayOffset_, pattern_);
@@ -600,7 +600,7 @@ std::string formatWithPattern(std::string calendarName, int yearOffset, int date
 
 std::string formatDate(std::string calendarName, int dayOffset,
                        icu::DateFormat::EStyle dateStyle) {
-  return formatWithStyle(calendarName, /*yearOffset*/ 0, dayOffset, dateStyle, /*timeStyle*/ icu::DateFormat::EStyle::kNone);
+  return formatWithStyle(std::move(calendarName), /*yearOffset*/ 0, dayOffset, dateStyle, /*timeStyle*/ icu::DateFormat::EStyle::kNone);
 }
 
 std::string formatTime(icu::DateFormat::EStyle timeStyle) {
diff --git a/src/InputState.h b/src/InputState.h
index 9de166d..9aa1130 100644
--- a/src/InputState.h
+++ b/src/InputState.h
@@ -69,6 +69,7 @@ struct NotEmpty : InputState {
       : composingBuffer(std::move(buf)),
         cursorIndex(index),
         tooltip(tooltipText) {}
+  ~NotEmpty() override = default;
 
   const std::string composingBuffer;
 
@@ -101,6 +102,11 @@ struct ChoosingCandidate : NotEmpty {
     const std::string reading;
     const std::string value;
   };
+
+  std::unique_ptr<ChoosingCandidate> copy() {
+    return std::make_unique<InputStates::ChoosingCandidate>(
+        composingBuffer, cursorIndex, candidates);
+  }
 };
 
 inline bool operator==(const ChoosingCandidate::Candidate& a,
@@ -136,6 +142,58 @@ struct Marking : NotEmpty {
   const std::string tail;
   const std::string reading;
   const bool acceptable;
+
+  std::unique_ptr<InputStates::Marking> copy() {
+    return std::make_unique<InputStates::Marking>(
+        composingBuffer, cursorIndex, tooltip, markStartGridCursorIndex, head,
+        markedText, tail, reading, acceptable);
+  }
+};
+
+struct SelectingDictionary : NotEmpty {
+  SelectingDictionary(std::unique_ptr<NotEmpty> previousState,
+                      std::string selectedPhrase, size_t selectedIndex,
+                      std::vector<std::string> menu)
+      : NotEmpty(previousState->composingBuffer, previousState->cursorIndex,
+                 previousState->tooltip),
+        previousState(std::move(previousState)),
+        selectedPhrase(std::move(selectedPhrase)),
+        selectedCandidateIndex(selectedIndex),
+        menu(std::move(menu)) {}
+
+  std::unique_ptr<NotEmpty> previousState;
+  std::string selectedPhrase;
+  size_t selectedCandidateIndex;
+  std::vector<std::string> menu;
+
+  std::unique_ptr<SelectingDictionary> copy() {
+    ChoosingCandidate* choosingCandidate =
+        dynamic_cast<ChoosingCandidate*>(previousState.get());
+    Marking* marking = dynamic_cast<Marking*>(previousState.get());
+    std::unique_ptr<NotEmpty> copy;
+
+    if (choosingCandidate != nullptr) {
+      copy = choosingCandidate->copy();
+    } else if (marking != nullptr) {
+      copy = marking->copy();
+    }
+
+    return std::make_unique<SelectingDictionary>(
+        std::move(copy), selectedPhrase, selectedCandidateIndex, menu);
+  }
+};
+
+struct ShowingCharInfo : NotEmpty {
+  ShowingCharInfo(std::unique_ptr<SelectingDictionary> previousState,
+                  std::string selectedPhrase)
+      : NotEmpty(previousState->previousState->composingBuffer,
+                 previousState->previousState->cursorIndex,
+                 previousState->previousState->tooltip),
+        previousState(std::move(previousState)),
+        selectedPhrase(std::move(selectedPhrase)) {}
+
+  std::unique_ptr<SelectingDictionary> previousState;
+  std::string selectedPhrase;
 };
 
 }  // namespace InputStates
diff --git a/src/KeyHandler.cpp b/src/KeyHandler.cpp
index 95ca85d..28ca0fd 100644
--- a/src/KeyHandler.cpp
+++ b/src/KeyHandler.cpp
@@ -96,7 +96,10 @@ KeyHandler::KeyHandler(
       userPhraseAdder_(std::move(userPhraseAdder)),
       localizedStrings_(std::move(localizedStrings)),
       userOverrideModel_(kUserOverrideModelCapacity, kObservedOverrideHalfLife),
-      reading_(Formosa::Mandarin::BopomofoKeyboardLayout::StandardLayout()) {}
+      reading_(Formosa::Mandarin::BopomofoKeyboardLayout::StandardLayout()) {
+  dictionaryServices_ = std::make_unique<DictionaryServices>();
+  dictionaryServices_->load();
+}
 
 bool KeyHandler::handle(Key key, McBopomofo::InputState* state,
                         const StateCallback& stateCallback,
@@ -317,6 +320,20 @@ bool KeyHandler::handle(Key key, McBopomofo::InputState* state,
     return true;
   }
 
+  // Question key
+  if (simpleAscii == '?') {
+    auto* marking = dynamic_cast<InputStates::Marking*>(state);
+    if (marking != nullptr) {
+      // Enter the state to select a dictionary service.
+      std::string markedText = marking->markedText;
+      std::unique_ptr<InputStates::Marking> copy = marking->copy();
+      auto selecting =
+          buildSelectingDictionaryState(std::move(copy), markedText, 0);
+      stateCallback(std::move(selecting));
+      return true;
+    }
+  }
+
   // Punctuation key: backtick or grave accent.
   if (simpleAscii == kPunctuationListKey &&
       lm_->hasUnigrams(kPunctuationListUnigramKey)) {
@@ -339,6 +356,7 @@ bool KeyHandler::handle(Key key, McBopomofo::InputState* state,
   if (key.ascii != 0) {
     std::string chrStr(1, key.ascii);
     std::string unigram;
+
     if (key.ctrlPressed) {
       unigram = std::string(kCtrlPunctuationKeyPrefix) + chrStr;
       return handlePunctuation(unigram, stateCallback, errorCallback);
@@ -388,6 +406,13 @@ bool KeyHandler::handle(Key key, McBopomofo::InputState* state,
 
   // No key is handled. Refresh and consume the key.
   if (maybeNotEmptyState != nullptr) {
+    // It is possible that FCITX just passes a single shift key event here.
+    // When it is in the marking state, we do not want to go back to the
+    // inputting state anyway.
+    auto* marking = dynamic_cast<InputStates::Marking*>(state);
+    if (marking != nullptr) {
+      return true;
+    }
     errorCallback();
     stateCallback(buildInputtingState());
     return true;
@@ -411,6 +436,13 @@ void KeyHandler::candidateSelected(
   stateCallback(buildInputtingState());
 }
 
+void KeyHandler::dictionaryServiceSelected(std::string phrase, size_t index,
+                                           InputState* currentState,
+                                           const StateCallback& stateCallback) {
+  dictionaryServices_->lookup(std::move(phrase), index, currentState,
+                              stateCallback);
+}
+
 void KeyHandler::candidatePanelCancelled(const StateCallback& stateCallback) {
   if (inputMode_ == InputMode::PlainBopomofo) {
     reset();
@@ -754,7 +786,7 @@ KeyHandler::ComposedString KeyHandler::getComposedString(size_t builderCursor) {
   // not-empty) between them.
   //
   // We'll also need to compute the UTF-8 cursor index. The idea here is we
-  // use a "running" index that will eventually catch the cursor index in the
+  // use a "running" index_ that will eventually catch the cursor index_ in the
   // builder. The tricky part is that if the spanning length of the node that
   // the cursor is at does not agree with the actual codepoint count of the
   // node's value, we'll need to move the cursor at the end of the node to
@@ -910,6 +942,20 @@ std::unique_ptr<InputStates::Marking> KeyHandler::buildMarkingState(
       marked, tail, readingValue, isValid);
 }
 
+bool KeyHandler::hasDictionaryServices() {
+  return dictionaryServices_->hasServices();
+}
+
+std::unique_ptr<InputStates::SelectingDictionary>
+KeyHandler::buildSelectingDictionaryState(
+    std::unique_ptr<InputStates::NotEmpty> nonEmptyState,
+    const std::string& selectedPhrase, size_t selectedIndex) {
+  std::vector<std::string> menu =
+      dictionaryServices_->menuForPhrase(selectedPhrase);
+  return std::make_unique<InputStates::SelectingDictionary>(
+      std::move(nonEmptyState), selectedPhrase, selectedIndex, menu);
+}
+
 size_t KeyHandler::actualCandidateCursorIndex() {
   size_t cursor = grid_.cursor();
 
diff --git a/src/KeyHandler.h b/src/KeyHandler.h
index 3ae0719..682fb27 100644
--- a/src/KeyHandler.h
+++ b/src/KeyHandler.h
@@ -30,6 +30,7 @@
 #include <string>
 #include <vector>
 
+#include "DictionaryService.h"
 #include "Engine/Mandarin/Mandarin.h"
 #include "Engine/McBopomofoLM.h"
 #include "Engine/UserOverrideModel.h"
@@ -75,6 +76,10 @@ class KeyHandler {
       const InputStates::ChoosingCandidate::Candidate& candidate,
       const StateCallback& stateCallback);
 
+  void dictionaryServiceSelected(std::string phrase, size_t index,
+                                 InputState* currentState,
+                                 const StateCallback& stateCallback);
+
   // Candidate panel canceled. Can assume the context is in a candidate state.
   void candidatePanelCancelled(const StateCallback& stateCallback);
 
@@ -86,6 +91,17 @@ class KeyHandler {
 
   void reset();
 
+#pragma region Dictionary Services
+
+  bool hasDictionaryServices();
+
+  std::unique_ptr<InputStates::SelectingDictionary>
+  buildSelectingDictionaryState(
+      std::unique_ptr<InputStates::NotEmpty> nonEmptyState,
+      const std::string& selectedPhrase, size_t selectedIndex);
+
+#pragma endregion Dictionary Services
+
 #pragma region Settings
 
   McBopomofo::InputMode inputMode();
@@ -171,6 +187,7 @@ class KeyHandler {
   UserOverrideModel userOverrideModel_;
   Formosa::Mandarin::BopomofoReadingBuffer reading_;
   Formosa::Gramambular2::ReadingGrid::WalkResult latestWalk_;
+  std::shared_ptr<DictionaryServices> dictionaryServices_;
 
 #pragma region Settings
 
diff --git a/src/McBopomofo.cpp b/src/McBopomofo.cpp
index 3173eb0..669f417 100644
--- a/src/McBopomofo.cpp
+++ b/src/McBopomofo.cpp
@@ -124,6 +124,39 @@ class McBopomofoCandidateWord : public fcitx::CandidateWord {
   std::function<void(const std::string&)> callback_;
 };
 
+class McBopomofoDictionaryServiceWord : public fcitx::CandidateWord {
+ public:
+  McBopomofoDictionaryServiceWord(
+      fcitx::Text displayText, size_t index,
+      InputStates::SelectingDictionary* currentState,
+      std::shared_ptr<KeyHandler> keyHandler,
+      KeyHandler::StateCallback callback)
+      : fcitx::CandidateWord(std::move(displayText)),
+        index_(index),
+        currentState_(currentState),
+        keyHandler_(std::move(keyHandler)),
+        stateCallback_(std::move(callback)) {}
+
+  void select(fcitx::InputContext* /*unused*/) const override {
+    keyHandler_->dictionaryServiceSelected(
+        currentState_->selectedPhrase, index_, currentState_, stateCallback_);
+  }
+
+ private:
+  size_t index_;
+  InputStates::SelectingDictionary* currentState_;
+  std::shared_ptr<KeyHandler> keyHandler_;
+  KeyHandler::StateCallback stateCallback_;
+  std::function<void(const std::string&)> callback_;
+};
+
+class McBopomofoTextOnlyCandidateWord : public fcitx::CandidateWord {
+ public:
+  McBopomofoTextOnlyCandidateWord(fcitx::Text displayText)
+      : fcitx::CandidateWord(std::move(displayText)) {}
+  void select(fcitx::InputContext* /*unused*/) const override {}
+};
+
 class KeyHandlerLocalizedString : public KeyHandler::LocalizedStrings {
  public:
   std::string cursorIsBetweenSyllables(
@@ -378,7 +411,10 @@ void McBopomofoEngine::keyEvent(const fcitx::InputMethodEntry& /*unused*/,
     return;
   }
 
-  if (dynamic_cast<InputStates::ChoosingCandidate*>(state_.get()) != nullptr) {
+  if (dynamic_cast<InputStates::ChoosingCandidate*>(state_.get()) != nullptr ||
+      dynamic_cast<InputStates::SelectingDictionary*>(state_.get()) !=
+          nullptr ||
+      dynamic_cast<InputStates::ShowingCharInfo*>(state_.get()) != nullptr) {
     // Absorb all keys when the candidate panel is on.
     keyEvent.filterAndAccept();
 
@@ -395,7 +431,6 @@ void McBopomofoEngine::keyEvent(const fcitx::InputMethodEntry& /*unused*/,
       enterNewState(context, std::make_unique<InputStates::Empty>());
       context->updateUserInterface(fcitx::UserInterfaceComponent::InputPanel);
       context->updatePreedit();
-
       return;
     }
 
@@ -408,7 +443,10 @@ void McBopomofoEngine::keyEvent(const fcitx::InputMethodEntry& /*unused*/,
           // TODO(unassigned): beep?
         });
     if (dynamic_cast<InputStates::ChoosingCandidate*>(state_.get()) !=
-        nullptr) {
+            nullptr ||
+        dynamic_cast<InputStates::SelectingDictionary*>(state_.get()) !=
+            nullptr ||
+        dynamic_cast<InputStates::ShowingCharInfo*>(state_.get()) != nullptr) {
       context->updateUserInterface(fcitx::UserInterfaceComponent::InputPanel);
       context->updatePreedit();
     }
@@ -447,6 +485,48 @@ void McBopomofoEngine::handleCandidateKeyEvent(
     return;
   }
 
+  bool keyIsCancel = false;
+
+  // When pressing "?" in the candidate list, tries to look up the candidate in
+  // dictionaries.
+  if (key.check(FcitxKey_question)) {
+    auto choosingCandidate =
+        dynamic_cast<InputStates::ChoosingCandidate*>(state_.get());
+    auto selectingDictionary =
+        dynamic_cast<InputStates::SelectingDictionary*>(state_.get());
+    auto showingCharInfo =
+        dynamic_cast<InputStates::ShowingCharInfo*>(state_.get());
+
+    if (choosingCandidate != nullptr) {
+      // Enter selecting dictionary service state.
+      if (keyHandler_->hasDictionaryServices()) {
+#ifdef USE_LEGACY_FCITX5_API
+        int page = candidateList->currentPage();
+        int pageSize = candidateList->size();
+        int selectedIndex = page * pageSize + candidateList->cursorIndex();
+        std::string phrase =
+            candidateList->candidate(selectedIndex)->text().toString();
+#else
+        int selectedIndex = candidateList->globalCursorIndex();
+        std::string phrase =
+            candidateList->candidate(selectedIndex).text().toString();
+#endif
+        std::unique_ptr<InputStates::ChoosingCandidate> copy =
+            choosingCandidate->copy();
+        auto state = keyHandler_->buildSelectingDictionaryState(
+            std::move(copy), phrase, selectedIndex);
+        enterNewState(context, std::move(state));
+        return;
+      }
+    } else if (selectingDictionary != nullptr) {
+      // Leave selecting dictionary service state.
+      keyIsCancel = true;
+    } else if (showingCharInfo != nullptr) {
+      // Leave selecting dictionary service state.
+      keyIsCancel = true;
+    }
+  }
+
   if (key.check(FcitxKey_Return)) {
     idx = candidateList->cursorIndex();
     if (idx < candidateList->size()) {
@@ -459,7 +539,42 @@ void McBopomofoEngine::handleCandidateKeyEvent(
     return;
   }
 
-  if (key.check(FcitxKey_Escape) || key.check(FcitxKey_BackSpace)) {
+  if (keyIsCancel || key.check(FcitxKey_Escape) ||
+      key.check(FcitxKey_BackSpace)) {
+    auto* showingCharInfo =
+        dynamic_cast<InputStates::ShowingCharInfo*>(state_.get());
+    if (showingCharInfo != nullptr) {
+      auto previous = showingCharInfo->previousState.get();
+      stateCallback(previous->copy());
+      return;
+    }
+
+    auto* selecting =
+        dynamic_cast<InputStates::SelectingDictionary*>(state_.get());
+    if (selecting != nullptr) {
+      auto previous = selecting->previousState.get();
+      auto* choosing = dynamic_cast<InputStates::ChoosingCandidate*>(previous);
+      if (choosing != nullptr) {
+        stateCallback(choosing->copy());
+
+#ifdef USE_LEGACY_FCITX5_API
+        auto maybeCandidateList = dynamic_cast<fcitx::CommonCandidateList*>(
+            context->inputPanel().candidateList());
+#else
+        auto* maybeCandidateList = dynamic_cast<fcitx::CommonCandidateList*>(
+            context->inputPanel().candidateList().get());
+#endif
+        size_t index = selecting->selectedCandidateIndex;
+        maybeCandidateList->setGlobalCursorIndex((int)index);
+        return;
+      }
+      auto* marking = dynamic_cast<InputStates::Marking*>(previous);
+      if (marking != nullptr) {
+        stateCallback(marking->copy());
+      }
+      return;
+    }
+
     keyHandler_->candidatePanelCancelled(
         [this, context](std::unique_ptr<InputState> next) {
           enterNewState(context, std::move(next));
@@ -578,6 +693,7 @@ void McBopomofoEngine::enterNewState(fcitx::InputContext* context,
 
   if (auto* empty = dynamic_cast<InputStates::Empty*>(currentPtr)) {
     handleEmptyState(context, prevPtr, empty);
+
   } else if (auto* emptyIgnoringPrevious =
                  dynamic_cast<InputStates::EmptyIgnoringPrevious*>(
                      currentPtr)) {
@@ -595,6 +711,12 @@ void McBopomofoEngine::enterNewState(fcitx::InputContext* context,
   } else if (auto* candidates =
                  dynamic_cast<InputStates::ChoosingCandidate*>(currentPtr)) {
     handleCandidatesState(context, prevPtr, candidates);
+  } else if (auto* selecting =
+                 dynamic_cast<InputStates::SelectingDictionary*>(currentPtr)) {
+    handleCandidatesState(context, prevPtr, selecting);
+  } else if (auto* showingCharInfo =
+                 dynamic_cast<InputStates::ShowingCharInfo*>(currentPtr)) {
+    handleCandidatesState(context, prevPtr, showingCharInfo);
   } else if (auto* marking = dynamic_cast<InputStates::Marking*>(currentPtr)) {
     handleMarkingState(context, prevPtr, marking);
   }
@@ -638,9 +760,9 @@ void McBopomofoEngine::handleInputtingState(fcitx::InputContext* context,
   updatePreedit(context, current);
 }
 
-void McBopomofoEngine::handleCandidatesState(
-    fcitx::InputContext* context, InputState* /*unused*/,
-    InputStates::ChoosingCandidate* current) {
+void McBopomofoEngine::handleCandidatesState(fcitx::InputContext* context,
+                                             InputState* /*unused*/,
+                                             InputStates::NotEmpty* current) {
   std::unique_ptr<fcitx::CommonCandidateList> candidateList =
       std::make_unique<fcitx::CommonCandidateList>();
 
@@ -685,45 +807,93 @@ void McBopomofoEngine::handleCandidatesState(
   fcitx::CandidateLayoutHint layoutHint = getCandidateLayoutHint();
   candidateList->setLayoutHint(layoutHint);
 
-  // Construct the candidate list with special care for candidates that have
-  // the same values. The display text of such a candidate will be in the form
-  // of "value (reading)" to help user disambiguate those candidates.
-
-  std::unordered_map<std::string, size_t> valueCountMap;
-
   KeyHandler::StateCallback callback =
       [this, context](std::unique_ptr<InputState> next) {
         enterNewState(context, std::move(next));
       };
 
-  for (const auto& c : current->candidates) {
-    ++valueCountMap[c.value];
-  }
+  auto choosing = dynamic_cast<InputStates::ChoosingCandidate*>(current);
+  auto selectingDictionary =
+      dynamic_cast<InputStates::SelectingDictionary*>(current);
+  auto showingCharInfo = dynamic_cast<InputStates::ShowingCharInfo*>(current);
+
+  if (choosing != nullptr) {
+    // Construct the candidate list with special care for candidates that have
+    // the same values. The display text of such a candidate will be in the form
+    // of "value (reading)" to help user disambiguate those candidates.
+
+    std::unordered_map<std::string, size_t> valueCountMap;
+
+    for (const auto& c : choosing->candidates) {
+      ++valueCountMap[c.value];
+    }
 
-  for (const auto& c : current->candidates) {
-    std::string displayText = c.value;
+    for (const auto& c : choosing->candidates) {
+      std::string displayText = c.value;
 
-    if (valueCountMap[displayText] > 1) {
-      displayText += " (";
-      std::string reading = c.reading;
-      std::replace(reading.begin(), reading.end(),
-                   KeyHandler::kJoinSeparator[0], ' ');
-      displayText += reading;
-      displayText += ")";
+      if (valueCountMap[displayText] > 1) {
+        displayText += " (";
+        std::string reading = c.reading;
+        std::replace(reading.begin(), reading.end(),
+                     KeyHandler::kJoinSeparator[0], ' ');
+        displayText += reading;
+        displayText += ")";
+      }
+
+#ifdef USE_LEGACY_FCITX5_API
+      fcitx::CandidateWord* candidate = new McBopomofoCandidateWord(
+          fcitx::Text(displayText), c, keyHandler_, callback);
+      // ownership of candidate is transferred to candidateList.
+      candidateList->append(candidate);
+#else
+      std::unique_ptr<fcitx::CandidateWord> candidate =
+          std::make_unique<McBopomofoCandidateWord>(fcitx::Text(displayText), c,
+                                                    keyHandler_, callback);
+      candidateList->append(std::move(candidate));
+#endif
+    }
+  } else if (selectingDictionary != nullptr) {
+    size_t index = 0;
+    for (const auto& menuItem : selectingDictionary->menu) {
+      std::string displayText = menuItem;
+
+#ifdef USE_LEGACY_FCITX5_API
+      fcitx::CandidateWord* candidate = new McBopomofoDictionaryServiceWord(
+          fcitx::Text(displayText), index, selectingDictionary, keyHandler_,
+          callback);
+      candidateList->append(candidate);
+#else
+      std::unique_ptr<fcitx::CandidateWord> candidate =
+          std::make_unique<McBopomofoDictionaryServiceWord>(
+              fcitx::Text(displayText), index, selectingDictionary, keyHandler_,
+              callback);
+      candidateList->append(std::move(candidate));
+#endif
+      index++;
     }
+  } else if (showingCharInfo != nullptr) {
+    std::vector<std::string> menu;
+    menu.emplace_back(fmt::format(_("UTF8 String Length: {0}"),
+                                  showingCharInfo->selectedPhrase.length()));
+    size_t count = CodePointCount(showingCharInfo->selectedPhrase);
+    menu.emplace_back(fmt::format(_("Code Point Count: {0}"), count));
+
+    for (const auto& menuItem : menu) {
+      std::string displayText = menuItem;
 
 #ifdef USE_LEGACY_FCITX5_API
-    fcitx::CandidateWord* candidate = new McBopomofoCandidateWord(
-        fcitx::Text(displayText), c, keyHandler_, callback);
-    // ownership of candidate is transferred to candidateList.
-    candidateList->append(candidate);
+      fcitx::CandidateWord* candidate =
+          new McBopomofoTextOnlyCandidateWord(fcitx::Text(displayText));
+      candidateList->append(candidate);
 #else
-    std::unique_ptr<fcitx::CandidateWord> candidate =
-        std::make_unique<McBopomofoCandidateWord>(fcitx::Text(displayText), c,
-                                                  keyHandler_, callback);
-    candidateList->append(std::move(candidate));
+      std::unique_ptr<fcitx::CandidateWord> candidate =
+          std::make_unique<McBopomofoTextOnlyCandidateWord>(
+              fcitx::Text(displayText));
+      candidateList->append(std::move(candidate));
 #endif
+    }
   }
+
   candidateList->toCursorMovable()->nextCandidate();
   context->inputPanel().reset();
   context->inputPanel().setCandidateList(std::move(candidateList));
@@ -743,6 +913,14 @@ void McBopomofoEngine::handleMarkingState(fcitx::InputContext* context,
 fcitx::CandidateLayoutHint McBopomofoEngine::getCandidateLayoutHint() const {
   fcitx::CandidateLayoutHint layoutHint = fcitx::CandidateLayoutHint::NotSet;
 
+  if (dynamic_cast<InputStates::SelectingDictionary*>(state_.get()) !=
+      nullptr) {
+    return fcitx::CandidateLayoutHint::Vertical;
+  }
+  if (dynamic_cast<InputStates::ShowingCharInfo*>(state_.get()) != nullptr) {
+    return fcitx::CandidateLayoutHint::Vertical;
+  }
+
   auto choosingCandidate =
       dynamic_cast<InputStates::ChoosingCandidate*>(state_.get());
   if (choosingCandidate != nullptr) {
diff --git a/src/McBopomofo.h b/src/McBopomofo.h
index e1bfbec..61eec35 100644
--- a/src/McBopomofo.h
+++ b/src/McBopomofo.h
@@ -147,9 +147,7 @@ FCITX_CONFIGURATION(
 
     fcitx::Option<bool> addScriptHookEnabled{
         this, "AddScriptHookEnabled",
-        _("Run the hook script after adding a phrase"), false};
-
-);
+        _("Run the hook script after adding a phrase"), false};);
 
 class McBopomofoEngine : public fcitx::InputMethodEngine {
  public:
@@ -192,7 +190,7 @@ class McBopomofoEngine : public fcitx::InputMethodEngine {
   void handleInputtingState(fcitx::InputContext* context, InputState* prev,
                             InputStates::Inputting* current);
   void handleCandidatesState(fcitx::InputContext* context, InputState* prev,
-                             InputStates::ChoosingCandidate* current);
+                             InputStates::NotEmpty* current);
   void handleMarkingState(fcitx::InputContext* context, InputState* prev,
                           InputStates::Marking* current);