So, essentially you've got a positive ball which is identical to the size of the atom.

首先你要有一个和原子差不多大小的,带正电荷的球。

麻省理工公开课 - 固态化学导论课程节选

and you've got to hit a ball which is on the ground with a sort of croquet mallets.

你要用一个类似木槌的东西去打击地上的球。

知道马球吗？ - SpeakingMax英语口语达人

it looks like we were a little bit successful, I saw some backbouncing.

我看到有些球被背散射了，我们要看看有多少个。

麻省理工公开课 - 化学原理课程节选

so you get the other team go out and what they do is field.

另外一队在外面，他们要做的就是截球。

板球的规则 - SpeakingMax英语口语达人