It works well for readily available sites like search engines, online bookstores, and even many library catalogs, but secured e-journal databases need federated search to be installed.
它在像搜索引擎，在线书店甚至图书馆目录等搜索中工作良好，但是那些有保护的电子期刊数据库则需要安装联邦检索。
I learned all about OCLC when I worked on the online library catalog, because OCLC catalogs books and provides services to libraries everywhere.
当我在参与在线图书馆编目项目时深入了解了OCLC，因为OCLC一直被用于编目书籍和向图书馆提供服务。
Library of Congress Online Catalogs: We're pretty sure most librarians have heard of this site, but it's seriously one of the best reference sites on the Web.
Library of Congress Online Catalogs：我们十分确定大多数图书管理员已经听过这个网站了，严格地说它是目前网络上最好的一个引用站点。
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