string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%96%E7%95%8C%E6%9C%80%E9%95%BF%E7%9A%8410%E6%9D%A1%E6%B2%B3%E6%B5%81%E6%98%AF%E5%93%AA%E9%87%8C%E7%9A%84 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
世界最长的10条河流是哪里的
