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.play an (important) role in=play an (important) part in 在……起(重要)作用，担任……(重要)角色。如：
China is playing an important part in international trading.
Keanu Reeves played an important role in Speed.
2.owe表示“负债”，如：
Don't forget you still owe me 5000 RMB!
owe ... to“感激;把……归功于……”
The director owed his success to his family.
3.afford买得起
eg: He can afford an apartment.
他能买得起一套住房。
afford经受得住;承担得起
eg: Can you afford $12000 for ...?
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