If you've got a problem that has units associated with it, do the exercise of carrying the units through because, guess what?

如果你做到一个跟单位有关的题目，请你在做题目的时候密切注意它，因为，猜猜是什么？

麻省理工公开课 - 固态化学导论课程节选

But in terms of SI units, which become much more useful if you're actually trying to use intensity in a problem and cancel out your units, we're just talking about joules per second is what intensity is.

但是用国际单位制，这个变得越来越有用了,如果你实际上在使用强度,来解决问题和约化单位，我们仅仅讨论每秒钟的焦耳,这就是强度。

麻省理工公开课 - 化学原理课程节选