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5.It was under attack for 900 days, but the people of the city never gave in. 城市遭到攻击达900天，但是圣彼得堡人民从未屈服。1). under attack 遭到攻击;attack n. / vt. 攻击;袭击;E.g. make an attack on the enemy 攻击敌人;The PLA soldiers attacked the enemy under over of darkness. 解放军战士趁着黑夜袭击敌人。2). under prep. 在……的过程中; E.g. The matter is under discussion. 这件事情还在讨论之中。The road is under repair and is closed to motor traffic. 正在修路，禁止机动车辆通行。3). give in vi.屈服;让步于;如要表示“向某人屈服”，要用give in to sb.; E.g. The murderer had to give in to the police in the end. 那个凶犯最后不得不向警察屈服。
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