string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%80%E4%B9%88%E6%98%AF%E8%80%90%E5%8E%8B%E5%BC%BA%E5%BA%A6 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
什么是耐压强度
