You must learn how to use dictionary and reference-books.

你们要学会使用词典和工具书。

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The dictionary, encyclopedia and annual are three important reference books.

的翻译是：该词典，百科全书，每年有三个重要的参考书籍。

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There are many books of reference, such as dictionary and handbook.

有许多参考书，如字典和手册。

youdao

There are many books of reference, such as dictionary and handbook.

有许多参考书，如字典和手册。

youdao