string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E9%80%89%E6%8B%A9%E5%90%88%E9%80%82%E7%9A%84%E5%85%B3%E8%81%94%E8%AF%8D%E8%AF%AD%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
选择合适的关联词语是什么
