string(258) "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%E6%98%AF => Failed to connect to 101.89.159.206 port 38100: Connection refused"
目标群体划分的依据是
