这些书按科目分类。

The books are grouped together by subject.

《牛津词典》

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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图书馆的书是按科目分类的。

Thebooks in the library are classified by subject.

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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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学校里的学生按他们选择的科目分类。

The students in the school were classified by the subject they chose.

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学校里的学生按他们选择的科目分类。

The students in the school were classified by the subject they chose.

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