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.
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。
This site is a link directory for Google's custom search engine.
该站点是一个Google定制搜索引擎链接目录。
This directory contains the search index files produced by the Lucene search engine as shown in Figure 10.
此目录包含Lucene搜索引擎产生的搜索索引文件，如图10中所示。
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