string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%A8%E5%85%B3%E8%81%94%E8%AF%8D%E4%B8%A4%E5%8F%A5%E8%AF%9D%E5%90%88%E5%B9%B6%E6%88%90%E4%B8%80%E5%8F%A5%E8%AF%9D => Failed to connect to 14.116.215.7 port 38225: Connection refused"
用关联词两句话合并成一句话
