重点讲解：
1. a rash of 大量，许多（令人不快的事情）；
The has been a rash of robberies in the last two months.
上两个月发生了一连串的盗窃案。
2. under control 被控制住；得到控制；
The situation is under control.
局势已经得到控制。
3. part of 一些；部分；
It is all part of his grand design.
这都是他那宏图大略的一部分。
4. be exempted from 被免除的；被豁免的；
Students who get very high marks will be exempted from the final examination.
得分高的学生期终考试可以免试。