创建了站点地图XML文件并能通过Web服务器访问它之后，便可以通过支持搜索引擎所提供的URL注册服务把该文件提交给服务器。
Once you create the sitemap XML file and make it available through a Web server, it then can be submitted with the URL registration services that the supporting search engines provide.
当进行搜寻时，搜索引擎使用索引， 索引是服务器上所有文件的列表。
When conducting a search, a search engine makes use of an index, which is a list of all the documents on the server.
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