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

What can actually happen is that if you're in an enormous laboratory, which is made up of an enormous object, then you will find that you can, in fact, attach it to the wall.

其实真实的情况就是,如果你在一个巨大的实验室里,这个实验室由巨大的物体组成,你就会发现能够,将它与墙相连

耶鲁公开课 - 基础物理课程节选