string(264) "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%E4%B8%AA%E6%B5%B7%E5%B3%A1%E5%88%86%E5%88%AB%E6%98%AF => Failed to connect to 14.18.46.51 port 38044: Connection refused"
中国有哪三个海峡分别是
