"The organization doesn't have to expose its inner-most secrets to pull in somebody from New York and say here's how to hook up some propane tanks."

VOA: standard.2010.05.18

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