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%E8%AF%B4%E6%98%8E%E4%BB%80%E4%B9%88 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
基尼系数说明什么
