string(240) "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%E6%9C%89%E4%BB%80%E4%B9%88%E7%94%A8 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
基尼系数有什么用
