string(257) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%AD%A6%E9%9C%B8%E7%AC%94%E8%AE%B02020%E5%92%8C2021%E7%89%88%E7%9A%84%E5%8C%BA%E5%88%AB => Failed to connect to 101.89.117.144 port 38208: Connection refused"
学霸笔记2020和2021版的区别
