So, if we took the case of nitrogen, if we add an electron to nitrogen and go to n minus, we find that the change in energy is 7 kilojoules per mole.

如果我们以氮为例，如果我们给氮增加个电子令它变成-1价的氮，我们会发现能量的变化是，7，千焦每摩尔。

麻省理工公开课 - 化学原理课程节选

So, we are talking about a wealthy group, and of course, the thing that struck Schliemann almost amazingly was that in the circle of graves that we've been talking about, he found all kinds of precious things buried.

所以,我们所谈论的是一个富有的群体,当然,令谢里曼为之震惊的是,在这些墓葬圈之中,正如刚才提到的,他找到了品目繁多的奇珍异宝

耶鲁公开课 - 古希腊历史简介课程节选

We can also do a similar thing, and I'll keep my distance from the board, but we can instead be holding x constant, for example, putting x to be equal to zero, and then all we're doing is considering the electric field as a function of t.

我们也可以做类似的事情,把x固定为一个常数,例如令x等于零，然后,考虑电场作为时间的函数,这种情况下，我们划掉。

麻省理工公开课 - 化学原理课程节选