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. cut down 砍倒，减少，降低，缩短
The little boy cut down the young tree with an axe.
The doctor told me to cut down smoking and drinking.
与cut有关的短语
cut something from something 切下，割下
cut something away 切除，剪去
cut up 切碎
cut off切断，停止
e.g. They cut all the dead branches from the tree.
While we were cooking, the gas was suddenly cut off.
no longer 和no more
(1) no longer 侧重于“时间”，no more侧重于“数量，程度”等。
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