重点讲解：
1. hold on 稍等；等一下；
例句：Tell him to hold on a moment; I'll come soon.
告诉他等一等，我一会儿就来。
2. write down 写下；记下；
例句：Only by writing things down could I bring some sort of order to the confusion.
只有把东西记下来，我才能从混乱中理出些头绪来。
3. go out 外出交际；外出娱乐；
例句：It will be a marvellous occasion and they should go out and enjoy it.
这是个好时机，他们应该出去痛快地玩一玩。
4. what if （用于疑问句句首，尤用于询问不希望看到的事发生时的结果）如果…怎么办；
例句：What if relations between you and your neighbour have reached deadlock, and their behaviour is still unacceptable?
如果你和你的邻居已闹僵了，而他们的行为还是令人难以接受，那怎么办？
