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) (和can，could，be able to连用) 有 (时间、经济等) 条件(做某事) to do
We can't afford to pay such a price.
afford n. / pron. (出得起；买得起等)
They donot consider whether they can afford it or not.
(2) 经得起 (做某事或发生某事) (多 to do)
He could not afford to lose his fortune entirely.
win, beat, defeat 表示获胜、取胜的词语
(1) win v. 赢……，获胜，接比赛或奖项
win a game / a prize / an honor / a race.
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