然而，目前流行的检索工具大多基于关键字查询，常常出现信息过载或有用信息丢失等现象。
However, the currently common search engines are based on keyword query, which usually causes the overloading of information or losing of useful information.
现有的许多多媒体数据库系统只提供了基于媒体描述关键字的检索和查询，却忽略了另一个重要的信息来源——媒体的内容。
In many current multimedia database systems, query or retrieval is only based on descriptive KeyWords of media, it ignores another important information resource the content of media.
基于数字有机体数据库的搜索引擎使用户可以用一系列的关键字在多个数据库中检索同关键字相关的记录。
The search engine based on Digital Organism database System allows users to retrieve relevant records stored in multiple databases via a serial of keywords.
目前已有的检索系统主要采用基于关键字的全文检索以及分类检索技术。
So far, retrieval system is mainly based on the keyword search and classification technology.
目前已有的检索系统主要采用基于关键字的全文检索以及分类检索技术。
So far, retrieval system is mainly based on the keyword search and classification technology.
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