card index

例句：

1. 1.The library has a card index for all its books.
   图书馆有一个卡片索引，列出了所有书籍。
2. 2.She used the card index to find her lost wallet.
   她用卡片索引找到了她的丢失的钱包。
3. 3. The new card index will make it easier to find information about different topics.
   新的卡片索引将使查找不同主题的信息变得更加容易。