string(267) "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%E4%BB%A5%E4%B8%8A%E8%A2%AB%E7%A7%B0%E4%B8%BA%E5%99%AA%E9%9F%B3 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
多少分贝以上被称为噪音
