What makes it true that the person lecturing to you next Tuesday is Shelly Kagan, the very same person, what makes that true is that it's the very same soul.

那个下星期二给你讲课的,还是谢利·凯根,和现在是同一个人，所需要的条件是,有同一个灵魂。

耶鲁公开课 - 死亡课程节选

If your plan is to accelerate a 3 kg mass with an acceleration of 2 meters per second, you better have a rope that can furnish that force and it can take the tension of 6 Newtons.

如果你想用 2 米每秒平方的加速度,去拉一个 3 千克的物体,那么你就需要一根能提供拉力的绳子,并且它能够承受 6 牛的张力

耶鲁公开课 - 基础物理课程节选

If I had a third axis, I would draw a k, but we don't need that.

如果有第三根轴,我可以画一个矢量 k,但我们现在不需要它

耶鲁公开课 - 基础物理课程节选