string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%87%AA%E5%B7%B1%E4%B8%8A%E5%AD%A6%E7%9A%84%E5%A5%BD%E5%A4%84 => Failed to connect to 101.89.166.210 port 38089: Connection refused"
自己上学的好处
