You see the difference in electronegativity, square it, multiply it by one-quarter and raise that to the power e.

你看到了电负性的差异，开方，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

All of those slave societies had a population of slaves that was from one-quarter to one-half, and sometimes more, of the total population.

这些奴隶社会的奴隶人口都占总人口,的三分之一到一半,有时甚至更多

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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