The power of linearity is F=k1+k2 if I come across f of x, y, z equals k1 plus k2, if it is a linear equation, I don't have to go and solve it all over again.

线性的威力是,一个方程，如果它是个线性方程，那么我就不用再去解他了。

麻省理工公开课 - 固态化学导论课程节选

And on Friday in class, at the beginning of class, I'll go over just in all the detail you could possibly imagine everything you need where it is, what you do, what kind of calculators you can bring, which by the way are any calculator.

在周五那节课开始的时候，我会详细地告诉大家,你们所能想到的,在哪考，你要做什么，什么样的计算器可以带，顺便一提的是，什么样的计算器都可以。

麻省理工公开课 - 化学原理课程节选