在公元前3000年，男性开始从事记录、定义和解释事件的工作。

Males gained entry to the business of recording, defining and interpreting events in the third millennium B.C.

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因此本章的第一个任务就是定义和解释净现值、回报率和资本的机会成本。

So this chapter’s first task is to defineand explain net present value, rate of return, and opportunity cost of capital.

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张帆：定义和解释一个概念，一般是经济学家或者MBA老师做的。

Make sail: Define and explain an idea, it is economist commonly or Mr. MBA does.

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