So problems arise but they're interesting problems, and they are a function, one of the six functions, of the expression "It is raining."

问题就出现在这里，但这是有趣的问题,是六功能中的一个“

耶鲁公开课 - 文学理论导论课程节选

What's a function, what's a derivative, what's a second derivative, how to take derivatives of elementary functions, how to do elementary integrals.

什么是函数,什么是导数,什么是二阶导数,如何对初等函数求导,如何进行初等积分

耶鲁公开课 - 基础物理课程节选