Practice is the crucial link of document retrieval course and the subject selection is the essential of practice effect.
实习是文献检索课的关键环节，实习课题的选择是实习效果好坏的关键。
Other retrieval tools provide searching based on user profiles, document and subject profiles, document content and the use of intelligent agents.
其他的检索工具是基于使用者概况、文件与主题概况、文件内容、及使用智慧型代理人等以提供蒐寻的方法。
Figure 13 shows the document with the subject “Marked for retrieval".
图 13 显示的文档标上了 “Marked for retrieval”。
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