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。
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。
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。
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