All right. So now that we have a general idea of what we're talking about with shielding, we can now go back and think about why it is that the orbitals are ordered in the order that they are.

现在我们对于谈论的屏蔽,有一个整体观点了，我们现在可以回过头来考虑,为什么轨道是按照,那种规则排列的。

麻省理工公开课 - 化学原理课程节选

So, if you bought a newspaper it would be only two sheets because it was so expensive-- not all the thick paper that we have today-- and it would cost something like $10 or $20 in today's prices.

你要是在当时买报纸的话,恐怕只有两页纸,因为纸实在是太贵了-,而且我们现在用的那种厚纸很少见-,按照今天的物价水平,大概需要10至20美元。

耶鲁公开课 - 金融市场课程节选