来自《耶鲁大学开放课程：新生有机化学第7集第7集》

a constant potential energy greater than the total energy.

恒定的势能还是比总能量高
This is not just a mathematical curiosity,

这不仅是个有趣的数学问题
it actually happens for every atom in you, or in me.

事实上你我身上的每一个原子
Every atom has the electrons spend some of their time

其中的电子都会在某些时间
in regions where they have negative kinetic energy.

某些区域内具有负动能
It's not just something weird that never happens.

所以这并不是什么稀奇的事
And it happens at large distance from the nuclei where 1/r --

这个现象发生在远离原子核
that's Couloumb's Law -- where it stops changing very much.

根据库伦定律势能变化趋于平缓之处
When you get far enough,

当距离足够远
1/r gets really tiny and it's essentially zero,

1/r变得十分小趋于零
it doesn't change anymore. Right?

所以也就不怎么变化了
Then you have this situation in any real atom.

那每个真实的原子中都会出现上述现象