diff --git a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMInstantiator.swift b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMInstantiator.swift
index 13902097..598ced86 100644
--- a/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMInstantiator.swift
+++ b/Packages/vChewing_LangModelAssembly/Sources/LangModelAssembly/LMInstantiator.swift
@@ -238,6 +238,11 @@ public extension vChewingLM {
       return result.isEmpty ? nil : result
     }
 
+    public func queryFilteredValue(key: String) -> [String]? {
+      let result = lmFiltered.unigramsFor(key: key).map(\.value)
+      return result.isEmpty ? nil : result
+    }
+
     /// 插入臨時資料。
     /// - Parameters:
     ///   - key: 索引鍵陣列。
diff --git a/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_Core.swift b/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_Core.swift
index d3fbd051..7aa04dff 100644
--- a/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_Core.swift
+++ b/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_Core.swift
@@ -22,7 +22,15 @@ public class LMMgr {
     dataURL: LMMgr.userOverrideModelDataURL(.imeModeCHT))
 
   public static var currentLM: vChewingLM.LMInstantiator {
-    switch IMEApp.currentInputMode {
+    Self.getLM(mode: IMEApp.currentInputMode)
+  }
+
+  public static var currentUOM: vChewingLM.LMUserOverride {
+    Self.getUOM(mode: IMEApp.currentInputMode)
+  }
+
+  public static func getLM(mode: Shared.InputMode) -> vChewingLM.LMInstantiator {
+    switch mode {
     case .imeModeCHS:
       return Self.lmCHS
     case .imeModeCHT:
@@ -32,8 +40,8 @@ public class LMMgr {
     }
   }
 
-  public static var currentUOM: vChewingLM.LMUserOverride {
-    switch IMEApp.currentInputMode {
+  public static func getUOM(mode: Shared.InputMode) -> vChewingLM.LMUserOverride {
+    switch mode {
     case .imeModeCHS:
       return Self.uomCHS
     case .imeModeCHT:
diff --git a/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_UserPhraseStructure.swift b/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_UserPhraseStructure.swift
index f22e58e6..9e76e309 100644
--- a/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_UserPhraseStructure.swift
+++ b/Packages/vChewing_MainAssembly/Sources/MainAssembly/LMMgr_UserPhraseStructure.swift
@@ -24,10 +24,22 @@ public extension LMMgr {
       LMMgr.checkIfPhrasePairExists(userPhrase: value, mode: inputMode, keyArray: keyArray)
     }
 
+    public var joinedKey: String {
+      keyArray.joined(separator: "-")
+    }
+
+    public var isValid: Bool {
+      !keyArray.isEmpty && keyArray.filter(\.isEmpty).isEmpty && !value.isEmpty
+    }
+
     public var description: String {
+      descriptionCells.joined(separator: " ")
+    }
+
+    public var descriptionCells: [String] {
       var result = [String]()
       result.append(value)
-      result.append(keyArray.joined(separator: "-"))
+      result.append(joinedKey)
       if let weight = weight {
         result.append(weight.description)
       }
@@ -37,7 +49,7 @@ public extension LMMgr {
       if isConverted {
         result.append("#𝙃𝙪𝙢𝙖𝙣𝘾𝙝𝙚𝙘𝙠𝙍𝙚𝙦𝙪𝙞𝙧𝙚𝙙")
       }
-      return result.joined(separator: " ")
+      return result
     }
 
     public var crossConverted: UserPhrase {
@@ -49,8 +61,13 @@ public extension LMMgr {
       return result
     }
 
+    public var isAlreadyFiltered: Bool {
+      let results = LMMgr.getLM(mode: inputMode).queryFilteredValue(key: joinedKey) ?? []
+      return results.contains(value)
+    }
+
     public func write(toFilter: Bool) -> Bool {
-      guard LMMgr.chkUserLMFilesExist(inputMode) else { return false }
+      guard isValid, LMMgr.chkUserLMFilesExist(inputMode) else { return false }
 
       /// 施工筆記：
       /// 有些使用者的語彙檔案已經過於龐大了（超過一千行），