string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%A8%E4%B8%96%E7%95%8C%E5%9F%8E%E5%B8%82%E9%9D%A2%E7%A7%AF%E5%89%8D%E5%8D%81%E5%90%8D%E6%8E%92%E5%90%8D => Failed to connect to 14.18.117.71 port 38133: Connection refused"
全世界城市面积前十名排名
