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

It's often the final stage of long-term relationships that have gone bad.

经常而言，这处于一段濒临破裂感情的最后阶段。

耶鲁公开课 - 心理学导论课程节选