string(267) "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%E8%AE%A1%E7%AE%97%E6%96%B9%E6%B3%95%E7%9A%84%E6%94%B9%E8%BF%9B => Failed to connect to 101.89.159.206 port 38087: Connection refused"
基尼系数计算方法的改进
