该文件暗示搜索引擎不应搜索某些特殊页面，例如错误页面。
This file hints to the search engine that it should not index particular pages, such as error pages.
站点上通常都含有那些搜索引擎没必要建立索引的页面，例如脚本目录中的文件、管理页面和错误页面等等。
Usually on a site, there are pages that are not useful for a search engine to index, such as files in the scripts directory, administrative pages, error pages, and so on.
除了对访问者有用外，综述也可以带来一些SEO价值，例如把那些已具有良好的搜索引擎排名的文章作为关键词富链接。
Apart from being useful for your visitors, roundups can also bring some SEO value as they contain keyword rich links to posts that already have good chances of ranking in search engines.
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