diff --git a/src/hooks/dict.ts b/src/hooks/dict.ts
index 229e2eb5..27d2f91e 100644
--- a/src/hooks/dict.ts
+++ b/src/hooks/dict.ts
@@ -1,5 +1,6 @@
 import {Article, Word} from "@/types.ts";
 import {useBaseStore} from "@/stores/base.ts";
+import {markRaw} from "vue";
 
 
 export function useWordOptions() {
@@ -14,11 +15,8 @@ export function useWordOptions() {
     if (rIndex > -1) {
       store.collectWord.words.splice(rIndex, 1)
     } else {
-      let rIndex = store.known.words.findIndex(v => v.word.toLowerCase() === val.word.toLowerCase())
-      if (rIndex > -1) {
-        store.known.words.splice(rIndex, 1)
-      }
       store.collectWord.words.push(val)
+      // store.collectWord.words = markRaw(store.collectWord.words.concat([val]))
     }
   }
 
diff --git a/src/stores/base.ts b/src/stores/base.ts
index f9ae7535..36dd1b7c 100644
--- a/src/stores/base.ts
+++ b/src/stores/base.ts
@@ -76,10 +76,10 @@ export const useBaseStore = defineStore('base', {
       return this.word.bookList[2]
     },
     knownWords(): string[] {
-      return this.known.words.map((v: Word) => v.word)
+      return this.known.words.map((v: Word) => v.word.toLowerCase())
     },
     knownWordsWithSimpleWords() {
-      return this.known.words.map((v: Word) => v.word).concat(this.simpleWords)
+      return this.known.words.map((v: Word) => v.word.toLowerCase()).concat(this.simpleWords)
     },
     currentStudyWordDict(): Dict {
       if (this.word.studyIndex >= 0) {