重点讲解：
1. be supposed to do sth. 应当，应该，须；
例句：They're supposed to punch in by 8:30.
他们应该八点半钟打卡上班QpDvcuYFY&hgd)9H-。
2. at first 最初；起初；开始时；
例句：At first, he seemed surprised by my questions.
起初，他似乎对我的问题感到惊讶x&B#7oCrtdsz*.。
3. get the hang of 掌握…的窍门；熟悉…的门道；
例句：It's a bit tricky at first till you get the hang of it.
刚开始有点儿难，掌握窍门后就好了ru_V0yz=QQ0FZRza5m。
4. how come （用于因为惊讶而询问）怎么会这样呢，为什么；
例句：How come he made mistakes like that?
他为何犯那样的错误呢？
5. get used to sth./doing sth. 开始习惯于；
例句：He can't get used to working nights.
他不能适应夜间工作*t)pUjD4Tq3zRwrs。