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A group of graduates got together to visit their old university professor.
一群毕业生，各自在事业上都已有所建树，相约一起去看望他们年老的大学教授。
The conversation soon turned into complaints about stress in work and life. Offering his guests coffee， the professor went to the kitchen and returned with a large pot of coffee and a variety of cups—porcelain， plastic， glass， crystal， some plain-looking， some expensive， some exquisite—telling them to help themselves to the coffee.
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