电子伏特不是，就是一单位的电子伏特。

The electron volt is not a unit of potential difference.

youdao

或者用我最喜欢的单位，就是19。80电子伏特。

Or, in my favorite unit, 19.80 electron volts.

youdao

就是一单位的电子伏特。

That is one electron volt.

youdao

So the probability of having an electron at the nucleus in terms of probability per volume is very, very high.

在单位体积内发现,一个电子的概率非常非常大。

麻省理工公开课 - 化学原理课程节选

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

We have the minus because we're adding a negative charge from the electron.

有这个负号的原因是,我们得到一个电子后增加了一个单位负电荷。

麻省理工公开课 - 化学原理课程节选