sublibrary

例句：

1. 1.The library has a sublibrary for children's books.
   图书馆有一个为儿童书籍设立的子图书馆。
2. 2. The sublibrary is located in the basement of the main library.
   子图书馆位于主图书馆的地下室。
3. 3.The sublibrary contains a collection of rare books.
   子图书馆收藏了一套稀有的书籍。