string(242) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%8B%8F27%E6%88%98%E6%96%97%E6%9C%BA%E5%92%8C%E8%8B%8F30%E5%8C%BA%E5%88%AB => Failed to connect to 14.18.117.71 port 38069: Connection refused"
苏27战斗机和苏30区别
