string(230) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ba%E5%92%8C%E7%A0%94%E7%A9%B6%E7%94%9F%E7%9A%84%E5%8C%BA%E5%88%AB => Failed to connect to 14.18.46.51 port 38044: Connection refused"
ba和研究生的区别
