"If you were to design the perfect plug for a child's airway, you couldn't do much better than a hot dog tip."

VOA: standard.2010.02.23

I want to finish this discussion by including the anti-bonding orbital, and this is a tip for you when you're drawing your molecular orbital diagrams, any time you draw a bonding orbital, there is also an anti-bonding orbital that exists.

我想要以包含反键轨道,来结束这个讨论，告诉你们一个,画分子轨道图的小技巧，任何时候你画一个成键轨道，都会存在一个反键轨道。

麻省理工公开课 - 化学原理课程节选

This is the tip of the iceberg for any given sign.

但这只是冰山一角。

耶鲁公开课 - 文学理论导论课程节选