And you'll use each of those smiles at different points in your day and in your life.

你可以用其中的任意一种,在你生活的不同日子，不同情形下。

耶鲁公开课 - 心理学导论课程节选

There's something else about smiles which is going to come up, which your question raises, I think, which is going to come up in when we talk about emotional contagion and actually, some issues of morality.

其他与微笑有关的话题开始浮现了，你提出问题，我想，可能出现,当我们讨论情绪感染时，事实上，一些道德话题。

耶鲁公开课 - 心理学导论课程节选