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重点讲解：
1. figure out 想出；理解；弄清；
I can't figure out how to do this.
我弄不懂怎样做这件事。
2. all over 到处；遍及；
We have friends all over the world.
我们的朋友遍天下。
3. wipe out 摧毁；毁灭；使灭绝；
Last year's profits were virtually wiped out.
去年的利润几乎全都赔光了。
4. head off 阻止，防止（尤指不愉快的事）发生；
He would ask Congress to intervene and head off a strike.
他将要求国会进行干预，防止发生罢工。
n. 多样，种类，杂耍
