这些书按科目分类。
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.
图书馆的书是按照科目分类的。
图书馆的书是按照科目分类的。
图书馆的书是按科目分类的。
传统的图书馆分类卡片提供了3个查找特征，即作者，科目和标题。
Traditional library card catalogs provide lookup by three attributes: author, subject, and title.
传统的图书馆分类卡片提供了3个查找特征，即作者，科目和标题。
Traditional library card catalogs provide lookup by three attributes: author, subject, and title.
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