"They are going to work together in order to achieve the goals of the world -- that really, when you talk about the G20, you are talking about nineteen countries plus the E.U.

VOA: special.2009.10.02

This e term here is the energy, or in our case when we talk about an electron in a hydrogen atom, for example, the binding energy of that electron to the nucleus.

这里的“E“是指能量，或者在我们谈论一个,氢原子的电子时，举例来说，是电子对于原子核的结合能。

麻省理工公开课 - 化学原理课程节选

And what we say when we talk about the delta energy is I E 2 that this is going to be equal to i e 2, or the second ionization energy, or we could say the negative of the binding energy of a 2 s electron in b plus.

那么我们说,Δ，E，应该等于，或者说第二电离能，也就是正一价硼中，2，s，电子的,束缚能的负值。

麻省理工公开课 - 化学原理课程节选

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