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There is steam bursting from that hole.
6.ruin 1. n. a) [U] the cause or state of destruction and decay b) [C] a building that has been badly damaged or destroyed 2. vt. a) to spoil or completely destroy a person or thing b) to cause someone to loss all their money
The temple has fallen into ruin.
We visited the ruins of the temple. The heavy rain ruined our holiday.
The hurricane ruined all the houses here.
The flood ruined the crops.
If I lose my lawsuit(官司), the cost will ruin me.
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