stop words lis 即：停止词列表 就是已经被搜索引擎认为是没有必要收录的词，可能这词没意思，或者这个词非常高的密度了。为了节约服务器资源，搜索爬虫就拒绝在收录这样的词了。
-- ? “ ” 》 －－ able about above according accordingly
across actually after
afterwards again against ain't all allow allows almost alone along already also although always am among amongst
an and another any anybody anyhow anyone anything anyway anyways anywhere apart appear appreciate appropriate
are aren't
around as a's aside ask asking associated at available away awfully be became because become becomes becoming
