When Shepard did hit the golf balls, they traveled "for miles and miles," as he reported, because the gravity on the moon is one-sixth of the gravity on Earth.

VOA: special.2011.05.15

We have 266, as some of you might know who saw me counting ping-pong balls the other day in office hours.

看到了这些发泡胶球事实上,可以当作单层金原子核,我们有266个乒乓球。

麻省理工公开课 - 化学原理课程节选

and hit balls as well from the back of elephants, amongst other things.

是从象背上去击球，除此之外都是一样的。

知道马球吗？ - SpeakingMax英语口语达人

PROFESSOR: So, as you're getting your ping-pong balls -- do not throw them yet.

如果你觉得，你的准心很好的话，你们现在都拿到乒乓球。

麻省理工公开课 - 化学原理课程节选

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