string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%80%8E%E6%A0%B7%E4%B8%8D%E8%AE%A9%E5%AD%A6%E7%94%9F%E7%8E%A9%E6%89%8B%E6%9C%BA => Failed to connect to 14.18.117.71 port 38133: Connection refused"
怎样不让学生玩手机
