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重点讲解：
1. slow down 减速；放慢速度；使...慢下来
There was a sign telling motorists to slow down.
有一个让汽车司机减速的指示牌。
2. At first 起初；一开始
At first the place was strange to me.
起先我对这个地方不熟悉。
3. In the case of 至于；在...情况下
I dread to think what will happen in the case of a major emergency.
我不敢想像万一出现重大紧急情况会怎么样。
4. Over a long period 长期以来；日积月累
Smoking a lot of cigarettes can harm and even kill over a long period of time.
长期大量吸烟会危害身体健康，甚至导致死亡。
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