So, we just talked about the force law to describe the interaction between a proton and an electron. You told me that when the distance went to infinity, the force went to zero. What happens instead when the distance goes to zero? What happens to the force?

我们刚刚讨论了描述质子,和电子之间相互作用力的定律,当距离变为无穷时,力变为零，那当距离变为,零时会发生什么？,这时候力是多少？

麻省理工公开课 - 化学原理课程节选

When interest rates hit zero then they don't have it's a little bit like your steering system on your car freezing up or hitting a you're hydroplaning on the highway; your steering wheel doesn't work anymore.

当利率下跌至零时，它们没有,这有点儿像你汽车里的驾驶系统,冻结或是撞上了一个,你正在高速公路上滑行；,你的方向盘不再工作了。

耶鲁公开课 - 金融市场课程节选