In 1718, he ordered a man kept alive after being horribly tortured, so he could be tortured some more and suffer as long as humanly possible.

718年 他下令救活一名遭受酷刑的男子,却是为了尽可能长时间地折磨他

耶鲁公开课 - 欧洲文明课程节选

That is the whole triumph of calculus is to know that by looking at the position now, the position slightly later and taking the ratio and bringing later as close as possible to right now, we define a quantity that we can say is the velocity at this instant.

这就得靠微积分了,通过了解它现在的位置,和一小段时间以后的位置,计算它们的比,再让时间间隔尽可能缩短,我们就定义了一个,被我们称之为瞬时速度的物理量

耶鲁公开课 - 基础物理课程节选