string(296) "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%E4%B8%8A%E6%9C%80%E5%A4%A7%E7%9A%84%E6%B2%99%E6%BC%A0%E9%9D%A2%E7%A7%AF%E5%A4%A7%E7%BA%A6%E6%98%AF906%E4%B8%87 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
世界上最大的沙漠面积大约是906万
