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重点讲解：
1. keep up with 跟上（变化等）；
We must keep up with the times.
我们必须跟上时代前进的步伐。
2. show off 展示；
The player was given hardly any opportunities to show off his talents.
那位选手几乎没有得到什么机会展示自己的天赋。
3. suffer from (因疾病或处于其他不利境地而)受苦，受难，受折磨；
Many kids suffer from acne and angst.
许多年轻人都会受到青春痘和焦虑的困扰。
4. be indistinguishable from 难以区别的；难以分辨的；
Replica weapons are indistinguishable from the real thing.
仿真武器与真武器很难区分。
