string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%95%99%E5%B8%88%E4%B8%AA%E4%BA%BA%E4%B8%8D%E8%B6%B3%E4%B9%8B%E5%A4%84%E5%92%8C%E6%94%B9%E8%BF%9B%E6%8E%AA%E6%96%BD => Failed to connect to 101.91.112.32 port 38195: Connection refused"
教师个人不足之处和改进措施
