string(249) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9B%AE%E6%A0%87%E7%BE%A4%E4%BD%93%E5%88%92%E5%88%86%E7%9A%84%E4%BE%9D%E6%8D%AE => Failed to connect to 101.89.117.144 port 38022: Connection refused"
目标群体划分的依据
