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Card indexes in a library are beneficial to readers.
对于读者来说图书馆的卡片索引是有益的.
辞典例句
Files were located by using the card indexes.
案卷是使用卡片索引查找的.
英汉双解词典包含4367426条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。