为实现高性能、灵活性以及相关排序等，一些搜索引擎与数据库直接相连，从数据库提取数据并生成索引。
To achieve high performance, flexibility, relevance ranking, and so on, some search engines connect to databases directly, extract data, and generate indexes from databases.
为从深层网络提取有意义的数据，搜索引擎必须分析用户的搜索词，找出如何最佳负责安排这些查询调度给特定的数据库。
To extract meaningful data from the Deep Web, search engines have to analyze users' search terms and figure out how to broker those queries to particular databases.
uima类型系统定义能够在文档中找到并且能够被分析引擎提取的各种对象的类型。
The UIMA type system defines the various types of objects that might be found in documents and that can be extracted by analysis engines.
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