He is using the English translation of the German word frohlich from Nietzsche's The Gay Science.

他用的其实是德语“快乐的“一词的英文翻译,而那个词则来自尼采写的“快乐的科学家“这个标题。

耶鲁公开课 - 文学理论导论课程节选

I actually wrote an article, it was called, it was on the Lehman Brothers

我原先写过一篇文章，标题叫……是关于雷曼兄弟的，

研究美国经济 - SpeakingMax英语口语达人