这些书按科目分类。

The books are grouped together by subject.

《牛津词典》

图书馆的书是按科目分类的。

Thebooks in the library are classified by subject.

youdao

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.

youdao