string(294) "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%E4%B8%8A%E6%9C%80%E9%95%BF%E7%9A%84%E6%B2%B3%E6%B5%81%E5%89%8D%E4%B8%89%E5%90%8D%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
世界上最长的河流前三名是什么
