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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The Disaster Literature Database Management System(DLDBMS) is the knowledge foundation and information source of this consultation information system.

灾害文献数据库管理系统（DLDBMS）是这一咨询信息系统的知识基础和信息来源。

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Medical literature analysis and retrieval system online (MEDLINE) established by National Library of Medicine, USA (NLM) is the most important biomedical database all over the world.

美国国立医学图书馆(NLM)建立的医学文献分析和联机检索系统(MEDLI NE)是全球最具影响力的生物医学数据库。

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