So now let me just do some grade school substitution.

接下来做一些简单的代换。

哈佛公开课 - 计算机科学课程节选

So I've got this expression for prices here, here it is, and I want to plug it into that P there.

我们之前已经给出了价格的表达式,用它来代换这里的P

耶鲁公开课 - 博弈论课程节选

We want to do that because we have too many variables here. We've already got dV p we'll get rid of p as an additional variable and replace it with V which is already in here.

我们之所以要那么做,是因为这儿有太多变量了,我们已经有了dV，我们要把,作为额外的变量消去，用已存在的V代换它。

麻省理工公开课 - 热力学与动力学课程节选