What people did is they said let's define a unit of energy that represents a unit charge accelerated across a unit potential difference, and let's call that the electron volt.

前人们所做的就是他们说让我们确定,一个能量单位用来代表一单位电荷,加速穿过形成的一单位电势差，我们叫它电子伏特。

麻省理工公开课 - 固态化学导论课程节选

So, what we're going to define is just let's just capture 90% of that electron density.

所以，我们所定义的,只包括百分之九十的电子密度。

麻省理工公开课 - 化学原理课程节选

So here, let's combine these to define a new quantity.

我们把这些结合起来组成新的物理量。

麻省理工公开课 - 热力学与动力学课程节选

Now, in the South what developed and let's define it at least quickly what developed was one of the world's handful of true slave societies.

当时的南方变成了什么样,至少我们很快就能得出结论,当时的南方变成了世界历史上,为数不多的几个真正的奴隶社会之一

耶鲁公开课 - 美国内战与重建课程节选

Let's try equal equal because I didn't define it here.

让我们来试试双等于,因为在这里。

麻省理工公开课 - 计算机科学及编程导论课程节选

What is it that--First of all, a portfolio, let's define that.

首先，我们来定义一下什么是投资组合。

耶鲁公开课 - 金融市场课程节选

So let's just think exactly what this means, and that means that if we take away function and we define it in terms of n, l and m sub l, what we're defining here is the complete description of an orbital.

让我们来考虑一下这是什么意思，这是说如果我们不考虑波函数,而是用ｎ，ｌ，ｍ下标ｌ来定义它，我们定义的,是一个轨道的完整描述。

麻省理工公开课 - 化学原理课程节选

So, let's go ahead and define our variables here, they should be familiar to us. We have the mass, first of all, me m is equal to m e, so that's the electron mass.

让我们继续定义这些常数,我们对这些应该都很熟悉了，首先，我们有质量，m等于。

麻省理工公开课 - 化学原理课程节选

So let's -- we'll go to a brand new color, TS define A as u minus TS.

我们用一种新的颜色，定义A等于u减去。

麻省理工公开课 - 热力学与动力学课程节选