diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_Core.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_Core.swift
index 7fc268e5..2a1675ef 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_Core.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_Core.swift
@@ -18,8 +18,9 @@ public class CandidateCellData: Hashable {
   public var visualDimension: CGSize = .zero
   public var locale = ""
   public static var unifiedSize: Double = 16
-  public var key: String
+  public var selectionKey: String
   public var displayedText: String
+  public var spanLength: Int
   public var size: Double { Self.unifiedSize }
   public var isHighlighted: Bool = false
   public var whichLine: Int = 0
@@ -38,18 +39,22 @@ public class CandidateCellData: Hashable {
       : .init(red: 142 / 255, green: 142 / 255, blue: 147 / 255, alpha: 1)
   }
 
-  public init(key: String, displayedText: String, isSelected: Bool = false) {
-    self.key = key
+  public init(
+    key: String, displayedText: String,
+    spanLength spanningLength: Int? = nil, isSelected: Bool = false
+  ) {
+    selectionKey = key
     self.displayedText = displayedText
+    spanLength = max(spanningLength ?? displayedText.count, 1)
     isHighlighted = isSelected
   }
 
   public static func == (lhs: CandidateCellData, rhs: CandidateCellData) -> Bool {
-    lhs.key == rhs.key && lhs.displayedText == rhs.displayedText
+    lhs.selectionKey == rhs.selectionKey && lhs.displayedText == rhs.displayedText
   }
 
   public func hash(into hasher: inout Hasher) {
-    hasher.combine(key)
+    hasher.combine(selectionKey)
     hasher.combine(displayedText)
   }
 
@@ -150,7 +155,7 @@ public class CandidateCellData: Hashable {
       .paragraphStyle: Self.sharedParagraphStyle,
       .foregroundColor: fontColorKey,
     ]
-    let attrStrKey = NSAttributedString(string: key, attributes: attrKey)
+    let attrStrKey = NSAttributedString(string: selectionKey, attributes: attrKey)
     return attrStrKey
   }
 
diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_SwiftUIImpl.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_SwiftUIImpl.swift
index d9803bc4..b3fb4377 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_SwiftUIImpl.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidateCellData_SwiftUIImpl.swift
@@ -34,7 +34,7 @@ public extension CandidateCellData {
           themeColor.cornerRadius(6)
           VStack(spacing: 0) {
             HStack(spacing: 4) {
-              Text(verbatim: key).font(.custom("Menlo", size: fontSizeKey))
+              Text(verbatim: selectionKey).font(.custom("Menlo", size: fontSizeKey))
                 .foregroundColor(Color.white.opacity(0.8)).lineLimit(1)
               Text(verbatim: displayedText)
                 .font(.init(CTFontCreateUIFontForLanguage(.system, fontSizeCandidate, locale as CFString)!))
@@ -44,7 +44,7 @@ public extension CandidateCellData {
         } else {
           VStack(spacing: 0) {
             HStack(spacing: 4) {
-              Text(verbatim: key).font(.custom("Menlo", size: fontSizeKey))
+              Text(verbatim: selectionKey).font(.custom("Menlo", size: fontSizeKey))
                 .foregroundColor(Color.secondary).lineLimit(1)
               Text(verbatim: displayedText)
                 .font(.init(CTFontCreateUIFontForLanguage(.system, fontSizeCandidate, locale as CFString)!))
@@ -66,7 +66,7 @@ public extension CandidateCellData {
         }
         VStack(spacing: 0) {
           HStack(spacing: 4) {
-            Text(verbatim: key).font(.system(size: fontSizeKey).monospaced())
+            Text(verbatim: selectionKey).font(.system(size: fontSizeKey).monospaced())
               .foregroundColor(.init(nsColor: fontColorKey)).lineLimit(1)
             Text(verbatim: displayedText)
               .font(.init(CTFontCreateUIFontForLanguage(.system, fontSizeCandidate, locale as CFString)!))
diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidatePool.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidatePool.swift
index b00f731c..e5ddc816 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidatePool.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/CandidatePool.swift
@@ -77,7 +77,7 @@ public struct CandidatePool {
   ///   - direction: 橫向排列還是縱向排列（預設情況下是縱向）。
   ///   - locale: 區域編碼。例：「zh-Hans」或「zh-Hant」。
   public init(
-    candidates: [String], lines: Int = 3, selectionKeys: String = "123456789",
+    candidates: [([String], String)], lines: Int = 3, selectionKeys: String = "123456789",
     layout: LayoutOrientation = .vertical, locale: String = ""
   ) {
     self.layout = layout
@@ -86,7 +86,9 @@ public struct CandidatePool {
     shitCell = CandidateCellData(key: " ", displayedText: "💩", isSelected: false)
     blankCell.locale = locale
     self.selectionKeys = selectionKeys.isEmpty ? "123456789" : selectionKeys
-    var allCandidates = candidates.map { CandidateCellData(key: " ", displayedText: $0) }
+    var allCandidates = candidates.map {
+      CandidateCellData(key: " ", displayedText: $0.1, spanLength: $0.0.count)
+    }
     if allCandidates.isEmpty { allCandidates.append(blankCell) }
     candidateDataAll = allCandidates
     var currentColumn: [CandidateCellData] = []
@@ -203,12 +205,12 @@ public extension CandidatePool {
     for (i, candidateColumn) in candidateLines.enumerated() {
       if i != currentLineNumber {
         candidateColumn.forEach {
-          $0.key = " "
+          $0.selectionKey = " "
         }
       } else {
         for (i, neta) in candidateColumn.enumerated() {
-          if neta.key.isEmpty { continue }
-          neta.key = selectionKeys.map(\.description)[i]
+          if neta.selectionKey.isEmpty { continue }
+          neta.selectionKey = selectionKeys.map(\.description)[i]
         }
       }
     }
diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
index bcba6958..c8453d3a 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/CtlCandidateTDK.swift
@@ -73,7 +73,7 @@ public class CtlCandidateTDK: CtlCandidate, NSWindowDelegate {
     CandidateCellData.unifiedSize = candidateFont.pointSize
     guard let delegate = delegate else { return }
     Self.thePool = .init(
-      candidates: delegate.candidatePairs(conv: true).map(\.1), lines: maxLinesPerPage,
+      candidates: delegate.candidatePairs(conv: true), lines: maxLinesPerPage,
       selectionKeys: delegate.selectionKeys, layout: currentLayout.layoutTDK, locale: locale
     )
     Self.thePool.tooltip = tooltip
diff --git a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateTDK_SwiftUI.swift b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateTDK_SwiftUI.swift
index 33ce1fc9..b69953d3 100644
--- a/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateTDK_SwiftUI.swift
+++ b/Packages/vChewing_CandidateWindow/Sources/CandidateWindow/TDKCandidates/VwrCandidateTDK_SwiftUI.swift
@@ -371,9 +371,16 @@ struct VwrCandidateTDK_Previews: PreviewProvider {
   @State static var tooltip = "📼"
   @State static var oldOS: Bool = true
 
+  static var testCandidatesConverted: [([String], String)] {
+    testCandidates.map { candidate in
+      let firstValue: [String] = .init(repeating: "", count: candidate.count)
+      return (firstValue, candidate)
+    }
+  }
+
   static var thePoolX: CandidatePool {
     var result = CandidatePool(
-      candidates: testCandidates, lines: 4,
+      candidates: testCandidatesConverted, lines: 4,
       selectionKeys: "123456", layout: .horizontal
     )
     result.reverseLookupResult = Self.reverseLookupResult
@@ -384,7 +391,7 @@ struct VwrCandidateTDK_Previews: PreviewProvider {
 
   static var thePoolXS: CandidatePool {
     var result = CandidatePool(
-      candidates: testCandidates, lines: 1,
+      candidates: testCandidatesConverted, lines: 1,
       selectionKeys: "123456", layout: .horizontal
     )
     result.reverseLookupResult = Self.reverseLookupResult
@@ -395,7 +402,7 @@ struct VwrCandidateTDK_Previews: PreviewProvider {
 
   static var thePoolY: CandidatePool {
     var result = CandidatePool(
-      candidates: testCandidates, lines: 4,
+      candidates: testCandidatesConverted, lines: 4,
       selectionKeys: "123456", layout: .vertical
     )
     result.reverseLookupResult = Self.reverseLookupResult
@@ -407,7 +414,7 @@ struct VwrCandidateTDK_Previews: PreviewProvider {
 
   static var thePoolYS: CandidatePool {
     var result = CandidatePool(
-      candidates: testCandidates, lines: 1,
+      candidates: testCandidatesConverted, lines: 1,
       selectionKeys: "123456", layout: .vertical
     )
     result.reverseLookupResult = Self.reverseLookupResult
diff --git a/Packages/vChewing_CandidateWindow/Tests/CandidateWindowTests/CandidatePoolTests.swift b/Packages/vChewing_CandidateWindow/Tests/CandidateWindowTests/CandidatePoolTests.swift
index c36c818d..7b8f3b64 100644
--- a/Packages/vChewing_CandidateWindow/Tests/CandidateWindowTests/CandidatePoolTests.swift
+++ b/Packages/vChewing_CandidateWindow/Tests/CandidateWindowTests/CandidatePoolTests.swift
@@ -19,8 +19,17 @@ final class CandidatePoolTests: XCTestCase {
     "嗯", "哼", "啊",
   ]
 
+  var testCandidatesConverted: [([String], String)] {
+    testCandidates.map { candidate in
+      let firstValue: [String] = .init(repeating: "", count: candidate.count)
+      return (firstValue, candidate)
+    }
+  }
+
   func testPoolHorizontal() throws {
-    let pool = CandidatePool(candidates: testCandidates, selectionKeys: "123456", layout: .horizontal)
+    let pool = CandidatePool(
+      candidates: testCandidatesConverted, selectionKeys: "123456", layout: .horizontal
+    )
     var strOutput = ""
     pool.candidateLines.forEach {
       $0.forEach {
@@ -33,7 +42,9 @@ final class CandidatePoolTests: XCTestCase {
   }
 
   func testPoolVertical() throws {
-    let pool = CandidatePool(candidates: testCandidates, selectionKeys: "123456", layout: .vertical)
+    let pool = CandidatePool(
+      candidates: testCandidatesConverted, selectionKeys: "123456", layout: .vertical
+    )
     var strOutput = ""
     pool.candidateLines.forEach {
       $0.forEach {