But users need a "tracker" link to find what they're looking for - like the index card in a library catalogue.
但是用户需要tracker服务器来连接他们所要寻找的文件，就像图书馆目录中的索引卡。
A library catalogue is a list of the books and other material housed in that library.
一个图书馆的目录就是该馆所收藏的图书和其它资料的一份清单。
The museum has concentrated on building a matchless art-history library with a computerized catalogue of the world's art stock.
博物馆计划建成一个无可比拟的艺术史图书馆，内有输入电脑的世界艺术藏品的目录。
The museum has concentrated on building a matchless art-history library with a computerized catalogue of the world's art stock.
博物馆计划建成一个无可比拟的艺术史图书馆，内有输入电脑的世界艺术藏品的目录。
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