To put it simply, one could simply ask, ? what were the politics of Aristotle's Politics?

为求简约，人们可能会简略地问说，亚里士多德的《政治学》是何种政治？

耶鲁公开课 - 政治哲学导论课程节选

At any point on the graph you can take the derivative, which will be tangent to the curve at each point, and its numerical value will be what you can call the instantaneous velocity of that point and you can take the derivative over the derivative and call it the acceleration.

在图上的任意一点,你可以进行求导,得到曲线上每一点的切线斜率,所得到的数值,即为该点处的瞬时速度,然后你再求一次导,得出它的加速度

耶鲁公开课 - 基础物理课程节选

You can easily check by taking two derivatives that this particle does have the acceleration a.

你可以很容易地通过求两次导来验证,这个质点的加速度确实为 a

耶鲁公开课 - 基础物理课程节选