string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E5%9B%BD%E4%BA%BA%E5%9D%87%E6%94%B6%E5%85%A5%E8%AE%A1%E7%AE%97%E6%96%B9%E6%B3%95 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
中国人均收入计算方法
