Some people may need to take medicines before they work hard or exercise.

VOA: special.2009.07.28

It's good review exercise for some of you who have taken 115 or are about to take 150 or are there now.

对于学过115或者想要学习150的同学,这是一个不错的复习案例

耶鲁公开课 - 博弈论课程节选