Then when a stranger approaches or someone else approaches there they'll tend to give more of a greeting smile.

当陌生人或其他人接近时,他们是问候式微笑。

耶鲁公开课 - 心理学导论课程节选

The mouth moves up, particularly if somebody is attacking their record or ridiculing them, and they'll smile and--but it's not a sincere smile.

嘴唇移动，特别当有人攻击他们的记录,或嘲笑他们时，他们会微笑，但不是真诚的微笑。

耶鲁公开课 - 心理学导论课程节选

One group of children was a control group; the second group was taught to think back to experience that make them laugh or smile.

一群小孩组成对照组;,有人教第二组小孩回想,让他们大笑或微笑的经历。

哈佛公开课 - 幸福课课程节选

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

This is a smile of embarrassment or stress.

这种微笑处于尴尬或压力。

耶鲁公开课 - 心理学导论课程节选