string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%B3%E8%81%94%E8%AF%8D%E6%8A%8A%E4%B8%A4%E4%B8%AA%E5%8F%A5%E5%AD%90%E5%90%88%E4%B8%BA%E4%B8%80%E5%8F%A5 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
关联词把两个句子合为一句
