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英文般

Search Engine

A program that searches documents for specified keywords and returns a list of the documents where the keywords were found. Although search engine is really a general class of programs, the term is often used to specifically describe systems like Alta Vista and Excite that enable users to search for documents on the World Wide Web and USENET newsgroups.
Typically, a search engine works by sending out a spider to fetch as many documents as possible. Another program, called an indexer, then reads these documents and creates an index based on the words contained in each document. Each search engine uses a proprietary algorithm to create its indices such that, ideally, only meaningful results are returned for each query.

搜索引擎是一个能搜查文件指定关键字,并会列出一个含有关键词文件清单程序. 虽然搜索引擎是一个普通的程序,这一术语经常被用来描述具体的系统,例如在AltaVista和Excite,使用户能够在世界互联网和其他网络使用者搜索文件.
通常,搜索引擎的工作要先发出搜索信号获取尽可能多的文件. 另外一个方案,称为索引（分度器）,然后读取这些文件,并创建一个索引基于包含在文件每个字里. 每个搜索引擎都有一个自己专有工作法