You keep track of multiple keywords in a special document.

保持对一个特殊的文档中多个关键字的跟踪。

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Between them through a special identifier (keywords) to connect into a whole.

它们之间通过特殊的标识符(关键字)连接成一个整体。

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Second, send the keywords that obtain from first step to the special search engine through search engine interface of system, they carry out the real search behavior.

第二步，把第一步获取到的关键词通过系统的搜索引擎接口送到专门的搜索引擎，由它们执行实际的搜索行为。

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