互动封闭仿真课堂
1、智能交互 2、电子板书式视频教学 3、在线互动问答 4、封闭课堂启发式教学方式
随堂测试、知识梳理、易错点揭示、总结启迪智能错题本
听课中的错题能自动加入错题本，课后可方便复习及导出错题本升级服务
在线答疑、课后同类题练习、讲义下载、短信提醒He's going to join in the talk tonight.
take part in 指参加会议或群众性活动等，着重说明句子主语参加该项活动并在活动中发挥作用。如：
We'll take part in social practice during the summer vacation.
They often take part in outdoor activities.
Part前有形容词修饰时，要用不定冠词。如：
Lincoln took an active part in politics.
3.stand for代表，特征。如：
What do GRE stand for?
The dove stands for peace.
stand for赞同，支持，拥护。如：
Almost everyone in the world stand for peace.
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