And when he looked at her, he was so overwhelmed with emotion and sadness that he couldn't find her, that he began to cry.

当他看着她时，他被激动之情和悲伤淹没,因为他找不到她，于是他开始哭泣。

哈佛公开课 - 幸福课课程节选

I'm actually a little bit sad because I really like Michigan State University.

说实话，有点悲伤，因为我真的很喜欢密歇根州立大学。

寻找幸福 - SpeakingMax英语口语达人

And what will happen is as a result, I experience sadness, because that is what I am thinking about, and sadness-- a painful emotion, not a positive emotion-- leads to further narrow and constrict.

结果就是，我感觉悲伤，因为我一心只想那个，悲伤-,是一种痛苦的情绪，一种消极情绪-,导致进一步的收窄缩紧。

哈佛公开课 - 幸福课课程节选