string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%96%E7%95%8C%E5%8D%81%E5%A4%A7%E5%9F%8E%E5%B8%82%E9%9D%A2%E7%A7%AF => Failed to connect to 14.18.46.51 port 38044: Connection refused"
世界十大城市面积
