string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%9B%AE%E5%89%8D%E4%BB%80%E4%B9%88%E8%A1%8C%E4%B8%9A%E6%9C%89%E5%89%8D%E6%99%AF => Failed to connect to 14.18.117.71 port 38164: Connection refused"
目前什么行业有前景
