string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%A4%E4%B8%89%E4%B8%87%E5%8F%AF%E4%BB%A5%E6%8A%95%E8%B5%84%E4%BB%80%E4%B9%88%E8%A1%8C%E4%B8%9A => Failed to connect to 14.18.117.71 port 38220: Connection refused"
两三万可以投资什么行业
