If you hook a soul up to a body, you can tell the soul was there, by what the body is doing.

如果你通过身体探测灵魂，你可以知道灵魂在那，根据身体在干什么。

耶鲁公开课 - 死亡课程节选

You hook one end of the spring to a wall and you pull it from rest by some amount and you attach the one kilogram mass to it.

你把弹簧的一端固定在墙上,然后拉伸一段距离,接着你把 1 千克物体固定在上面

耶鲁公开课 - 基础物理课程节选