So, you have two sorts of smiles: A real happiness smile a Duchenne smile--called--also known as the Duchenne smile, and then a Pan Am smile, or greeting smile.

所以，有两种微笑：,真正开心的微笑,杜乡式微笑，泛美式微笑，或问候式微笑。

耶鲁公开课 - 心理学导论课程节选

Pan Am is a now defunct airline which had at that time They were--They don't call them stewardesses anymore but they're-- the stewardesses would come in and they would smile.

泛美现在已经倒闭了,他们不在称之为女服务员了,但是他们是-,女服务员进来就会微笑。

耶鲁公开课 - 心理学导论课程节选