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重点讲解：
1. ahead of 早于；在…之前；
I finished several days ahead of the deadline.
我是在最后期限的前几天完成的。
2. be exempt from 被免除的；被豁免的；
The interest on the money is exempt from tax.
这笔钱的利息免税。
3. benefit from 获益；对…有益；有利于；
Who exactly stands to benefit from these changes?
到底是谁会从这些变革中直接获益？
4. in case 以备；以防；免得；
You'd better take the keys in case I'm out.
你最好带上钥匙以防我不在家。
n. 奖品，战利品
