你有两个台球。
What's the role of the billiard balls at all?
那么台球的角色究竟是什么呢?
Now suppose I am looking at a pair of billiard balls.
现在假设我在寻找两个台球。
Except for electromagnetism, the basics of mechanics, which is the motion of Billiard balls and trucks and marbles and whatnot, was set up by Newton.
除电磁学外,力学的基础,也就是台球,卡车,弹球以及其它小玩意儿的运动原理,都是由牛顿建立起来的
I am modeling them as billiard balls of a finite dimension.
我把它们想象成具有有限尺寸的台球。
It is like an elastic collision between billiard balls.
就像是台球在,台球桌上发生弹性碰撞。
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