"Yay Exercise!" "If you want your child to have healthy habits, practice healthy habits too because you're your child's best role model."

VOA: special.2009.11.27

Now, the purpose of this exercise is to give you a little bit of practice in figuring out what these quantities are.

就有这样的结论,这个练习的作用时让你们理解,这些物理量是什么。

麻省理工公开课 - 热力学与动力学课程节选