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 “Markedfor retrieval”。
Data standards, metadata, document codes, subject indexes and filing systems are widely used to enable efficient information correlation, storage and retrieval.
数据标准、元数据、文件编码、主题索引和文件归档系统得到了广泛使用，以确保有效信息的相关性、存储和检索。
Because the aim of information retrieval is to serve the users, the correlated degree of indexing words and the subject of the document should be the criteria of drawing them.
情报检索的目的是为用户服务，因而标引词的提取应以其与文献主题内容相关程度为标准。
Aim: to explore how to select suitable searching words (subject word and random word) in medical document retrieval.
目的：探讨医学文献检索中如何对检索词(主题词和自由词等)进行适当的选择。
Aim: to explore how to select suitable searching words (subject word and random word) in medical document retrieval.
目的：探讨医学文献检索中如何对检索词(主题词和自由词等)进行适当的选择。
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