来自《耶鲁大学开放课程：博弈论 第6集 第6集》

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  So the payoff for Firm 1,
  公司1的收益
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  as it depends on the quantity that she produces and
  取决于她的产量
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  the quantity that the other firm produces,
  以及另一家公司的产量
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  is going to be prices times the quantity
  即公司1的收益是价格乘以她的产量
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  that Firm 1 produces minus costs times the quantity that she produces.
  再减去成本乘以她的产量
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  So this term here is revenues and this term here is total costs.
  也就是说用收入减去总成本
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  Revenues minus costs makes profits, and again,
  收入减去成本就是利润
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  for those of you who are less familiar with economics,
  对经济学不太了解的同学
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  I'm hoping this is not really too hard but you can read up on it.
  我觉得这个很简单 你们都能听懂吧
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  What I'm going to do here is I'm going to substitute in for prices.
  接下来我要用表达式来替换价格
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  So I've got this expression for prices here, here it is,
  我们之前已经给出了价格的表达式
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  and I want to plug it into that P there.
  用它来代换这里的P