他们正在把他的藏书按科目分类。

They are sorting his library according to the subjects.

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在图书馆，书籍通常是按科目分类的。

In a library books are usually classified by subjects.

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图书馆里的藏书按科目分类。

The books in the library were distributed according to subjects.

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图书馆的书按科目分类。

The books in the library are distributed according to subjects.

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图书馆的书按科目分类。

The books in the library are distributed according to subjects.

youdao