So, how could he know that the charge on the two particles was equal?

就是这两种粒子,电荷量是相等的？

麻省理工公开课 - 化学原理课程节选

Let me show you how you could use this pattern in an example or two or three.

下面我们来看几个例子，看看该如何使用这个句型。

Is it okay 课堂 - SpeakingMax英语口语达人