Subject indexing is the key step in creating subject retrieval system of water saving agriculture literature database.

主题标引是建立“节水农业文献数据库”主题检索系统的关键工作。

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With the spatial data management, the system can serve for conditional retrieval and special subject retrieval about spatial data and their attributes objectives.

该系统具有空间数据管理的特性、对象的空间分布查询、条件查询和专题查询等功能。

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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。

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And requiring email addresses so that union organizers can send employee emails on the corporate IT system is unbelievable in this day and age where all emails are subject to corporate oversight and litigation retrieval.

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