- There are a few equations that you need to memorize -- those are the very simple -- very, very simple equations, such as e equals h times nu -- hopefully you don't have to sit down and try to memorize that, hopefully we all know that already.

只有几个公式是需要记住的-,它们都非常简单，非常非常简单，比如，E，等于，h，乘以，ν,希望大家不需要再专门去背了，希望我们已经都记住了。

麻省理工公开课 - 化学原理课程节选

E to the power of minus one-quarter times the difference in electronegativity squared.

指数是四分之一,把他乘以四分之一，在移到e上去做指数。

麻省理工公开课 - 固态化学导论课程节选