string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%A7%86%E7%BD%91%E8%86%9C%E6%98%AF%E5%A4%9A%E5%B0%91%E5%88%86%E8%BE%A8%E7%8E%87 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
视网膜是多少分辨率
