An idea of abstraction, that idea of specification, is exactly what we want to use inside of our functions.

抽象的概念，规格化的概念,就是我们想要运用到。

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What this does, when you use relative risk you take some group of the population and you establish their risk as--at one.

当运用相对危险度这个概念时,要选定一个群组,并把这个群组的风险设为1

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