string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%9A%E5%B0%91%E5%88%86%E8%B4%9D%E5%B1%9E%E4%BA%8E%E5%99%AA%E5%A3%B0%E8%B6%85%E6%A0%87 => Failed to connect to 101.89.117.144 port 38017: Connection refused"
多少分贝属于噪声超标
