string(238) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E5%9B%BD%E6%9C%89%E5%93%AA%E4%B8%89%E5%A4%A7%E6%B5%B7%E5%B3%A1 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
中国有哪三大海峡
