此类的服务只有一个，它抽象在门户中定义的所有其他搜索服务。
There is only one such service and it abstracts all the other search services that have been defined in the portal.
所有实体的字段可以像只有一个文件那样被索引，并且是正则文本搜索可以匹配的实体。
All fields of an entity can be indexed as if it was a single document, and then regular text searches can be performed to retrieve the matching entities.
直到1992年年底，世界上也仅仅只有26个web网站，所以那个时候还不太需要去做一个搜索引擎出来。
By late 1992, there were only 26 websites in the world so there was not much need for a search engine.
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