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1. pack off：送走
The woman packed off her child to the daycare center before she went to her office.妇人在上班前先把孩子送到日间托儿中心。
混淆短语：pack up one's things：打包自己的东西
I guess I will have to stay up all night packing up my things.我猜我得熬夜打包东西了。
2. participate in：参加，参与
I will definitely participate in the college reunion party because I really miss my schoolmates.我一定会去参加大学同学会，因为我很想念我的同学。
3. pay attention to：注意
Parents should pay attention to what their children are going.父母应该关心他们的孩子在做什么。
4. pay off：偿清，还清
He owes the old man a large amount of money that it will probably take him a whole lifetime to pay off his debts.他欠那个老人一大笔钱，可能得花一辈子的时间才能还清债务。
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