string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%86%E8%BE%A8%E7%8E%87%E7%9A%84%E6%A6%82%E5%BF%B5%E5%8F%8A%E4%B8%BB%E8%A6%81%E8%B0%83%E8%8A%82%E6%96%B9%E6%B3%95 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
分辨率的概念及主要调节方法
