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%E5%90%88%E7%90%86%E7%95%8C%E9%99%90 => Failed to connect to 101.89.117.144 port 38208: Connection refused"
基尼系数合理界限
