string(231) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%9F%BA%E5%B0%BC%E7%B3%BB%E6%95%B0%E7%9A%84%E6%84%8F%E4%B9%89 => Failed to connect to 125.88.227.171 port 38114: Connection refused"
基尼系数的意义
