这基于这样的理论，即近距离，非键相互作用是排斥的，即立体应变。

This is based on the theory that close-range, nonbonded interactions are repulsive, i.e. Steric strain.

youdao

因此，当我们考虑一个键的长度的时候，这就应该是我们的键长，这是合理的，因为体系会在核间距达到这一距离时，能量到达最小值。

So, when we think about a bond length, this is going to be the length of our bond here, that makes sense because it's going to want to be at that distance that minimizes the energy.

youdao

我们还可以考虑一下距离，键的距离那么，大家认为其中哪一个键会更短一些？

We can also think about the distance, the bond distance. So, which would you say is going to be shorter in this case?

youdao

We see that the radius is shorter, so that means that the nitrogen-nitrogen bond is going to be shorter.

我们看到这个距离更短，这就意味着,氮与氮之间的键应该更短。

麻省理工公开课 - 化学原理课程节选

We can also think about the distance, the bond distance. So, which would you say is going to be shorter in this case?

我们还可以考虑一下距离，键的距离那么，大家认为其中哪一个键会更短一些？

麻省理工公开课 - 化学原理课程节选

What we're going to do in forming a molecule is just bring these two orbitals close together such that now we have their nucleus, the two nuclei, at a distance apart that's equal to the bond length.

我们在形成一个分子时要做的就是,把这两个轨道放到一起,这样我们有他们的原子核，两个原子核，它们之间的距离为键长。

麻省理工公开课 - 化学原理课程节选