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

耶鲁公开课 - 基础物理课程节选

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。

麻省理工公开课 - 固态化学导论课程节选

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。

麻省理工公开课 - 固态化学导论课程节选