string(260) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BD%91%E9%80%9F%E5%8D%95%E4%BD%8Dmb%E6%98%AF%E4%BB%80%E4%B9%88%E6%84%8F%E6%80%9D%E5%91%80 => Failed to connect to 125.88.227.171 port 38114: Connection refused"
网速单位mb是什么意思呀
