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重点讲解：
1. be able to do sth. 可以…的，能够…的；
You'll be able to read in peace.
你就能安心地读书了。
2. crash into 碰撞；相撞；
It's very unlikely that an asteroid will crash into Earth but the danger exists.
小行星撞地球的可能性很小，但依然存在这样的危险。
3. allow sb. to do sth. 允许；容许；准许；
The compromise will allow him to continue his free market reforms.
妥协将使他得以继续他的自由市场改革。
4. as if 好像；仿佛；
Anne shrugged, as if she didn't know.
安妮耸了耸肩，好像她并不知晓。
