library classification

例句：

1. 1. The library has a comprehensive classification system for its books.
   图书馆有一个全面的图书分类系统。
2. 2. The librarian was asked to classify the books according to their genres.
   图书馆员被要求根据书籍的类型进行分类。
3. 3. The new book classification system is expected to improve the efficiency of library services.
   新的图书分类系统预计将提高图书馆服务的效率。