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 non-interesting psychological answer, some people are better looking and there's more thing-- but the deeper answer is some people are better able to smile.

无聊的心理学答案，有些人更漂亮，有更多-,深刻点的答案，有些人更擅长微笑。

耶鲁公开课 - 心理学导论课程节选

Look at his smile, really more of a smirk.

看着他的笑容，那根本就是在奸笑。

耶鲁公开课 - 政治哲学导论课程节选