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重点讲解：
1. even if 即使；尽管；纵然；
例句：They'll stand by you even if you don't succeed.
即使你不成功他们也会支持你。
2. be exposed to 使暴露于（险境）；使遭受（危险或不快）；
例句：Women who are exposed to mercury, cadmium, or vinyl chloride before conceiving seem to be especially likely to have autistic kids.
女性在怀孕期间接触汞、镉或氯乙烯很有可能会生出自闭症患儿。
3. start out 起初是…；
例句：He started out to fix the car himself, but in the end, he had to ask for help.
起初他本打算自己修车，可最后他还是不得不请人帮忙。
4. leave alone 听…自便；随…去；不打扰；
例句：Some people need to confront a traumatic past; others find it better to leave it alone.
有人需要直面过去的创伤，有人则觉得不去想它为妙。
n. 鳍，鱼翅，鳍状物，散热片，五元纸币 vt. 装上鳍
