重点讲解：
1. go up （价格、数量或水平）上涨，上升；
Prices will go up, I suppose.
我觉得物价将会上涨。
2. in front of 在…前面；
We had our picture taken in front of the hotel.
我们在旅馆前照了相。
3. at least （数量）至少，不少于；
At least ten people were killed in the crash.
至少有十人在撞车事故中丧生。
4. usher in 开启；迎来；引入；
This would usher in a new revolution in physics.
而这将引发一场物理学的新革命。

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