string(265) "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%86%E6%9E%90%E5%88%86%E4%B8%BA%E5%93%AA%E5%87%A0%E7%B1%BB => Failed to connect to 14.18.117.71 port 38164: Connection refused"
目标群体分析分为哪几类
