You wanted to know your place in the universe, but you don't even have that kind of knowledge either, because you think you're writing novels, finding the cure for cancer, climbing Mount Everest.

你想知道自己在宇宙里的位置，但是你连那种知识都没有，因为你以为自己是在写小说，在寻找治疗癌症的办法，在攀登珠穆朗玛峰。

耶鲁公开课 - 死亡课程节选

Often a good thing to start with is to put the lowest ionization energy atom in the middle, and if you don't have charge separation then go with that structure, but if you do find you have a lot of separation, such as the case in negative 2, positive 2, and minus 1, then you want to say wait a second, this is really bad in terms of formal charge, let me go ahead and see what other options I have here.

通常一开始把电离能最低的原子,放在中心位置就很好了，如果你发现电荷没有分开,那么这个结构就没问题了，但是如果你发现有很多分开的电荷，比如这种情况，有负二，正二和负一，那么你会想要说等一下，从形式电荷来看这很不好，让我去看看其它可能的选择。

麻省理工公开课 - 化学原理课程节选