If it's a true happiness smile, that's actually bodes better for the relationship than a Pan Am, or greeting smile.

如果是一个真正开心的微笑，对这段感情来说是个好兆头,比问候式微笑好的多。

耶鲁公开课 - 心理学导论课程节选

You give it when you want people to like you, you want to join in; you want to make people feel positive about you.

当你想让人喜欢你时会有这种微笑，你想加入他们;,你想让人们对你有好印象。

耶鲁公开课 - 心理学导论课程节选

Yeah.Student: Do nonhuman primates' smiles Professor Paul Bloom: That's a good question.

非人的灵长类微笑,好问题。

耶鲁公开课 - 心理学导论课程节选

Okay. Please arbitrarily decide on the smiler.

好，请任意选择微笑者。

耶鲁公开课 - 心理学导论课程节选