string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=30%E4%B8%AA%E5%B8%B8%E8%A7%81%E7%9A%84%E5%85%B3%E8%81%94%E8%AF%8D%E9%82%A3%E4%B9%88%E5%A4%9A%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 14.18.117.71 port 38041: Connection refused"
30个常见的关联词那么多怎么办
