“我明白你的意思，”第三个人说。

I see what you mean, "said the third one."

youdao

“我想你是对的，”第三个人说。

I think you are right, "said the third one."

youdao

第三个人说，怎么能这样对待生活！

A third person retorts, "How can you treat life like this?"

youdao

Oh, by the way, there is a third person.

顺便说一下，还有第三个人。

麻省理工公开课 - 固态化学导论课程节选