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.calculate v: count eg. You can calculate easily with the help of computer. I must calculate how much money I spent last week.
He calculated the costs very carefully.
2. common adj: belonging equally the same to all eg. We have much common interest. Rice is common in south.
Smith is a very common last name in England. 该词构成的词组in common
Those two have something in common. They are brothers, but they have nothing in common.
3. universal adj: present or occurring everywhere eg. Football is a universal game.
This machine has a universal use in the home.
Pollution is a universal problem in the world.
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