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重点讲解：
1. foot the bill 付账；买单；
例句：Who is footing the bill for her extravagant holiday?
谁会为她奢侈的假日买单？
2. by any means 无论如何；
例句：You must finish the work in time by any means.
你无论如何都要及时完成这项工作。
3. sth. cost an arm and a leg （价格）昂贵；
例句：A week at a health farm can cost an arm and a leg.
在健身中心呆一个星期的花费会很昂贵。
4. be mad at sb. 生气，恼火；
例句：My brother is mad at me because I hit him.
我弟弟因为我打了他而生气。
n. 帮助，协助，协助的器械
vt. 帮助，协
