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.rain cats and dogs：倾盆大雨
Are you sure you want to go out now? It's raining cats and dogs outside.你确定要出门吗？现在外面可是倾盆大雨。
替换短语：torrential rain：倾盆大雨
Are you sure you want to go out now? It's having a torrential rain outside.你确定要出门吗？现在外面可是倾盆大雨。
2.rain off：因下雨延期
The outdoor opening ceremony was rained off last week, and will be held on the following Sunday.上周的户外开幕式因下雨延期了，将改在下周周天举行。
替换短语：be rained out：因下雨延期
The outdoor opening ceremony was rained out last week, and will be held on the following Sunday.上周的户外开幕式因下雨延期了，将改在下周周天举行。
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