This episode is about Unit 2 (Laughter heals) of the 1st module (Happiness) in the second semester of higher-school English. To interpret how laughter heals, many good effects of laughter are introduced with explaining the related hormone Cortisol. Variety of ways are showed in this lecture to express the meaning of playing joke on sb. Some phrase analyses and main vocabularies explanations are also included.

本集围绕第二学期模块一（Happiness）中的第二单元（笑容治愈Laughter heals）对笑进行探讨。第一讲主要介绍笑的好处和益处。主要介绍笑对人体健康的益处（尤其是减压和降低压力荷尔蒙）。同时，讲解了“开玩笑”的多种表达。相关词语辨析和讲解（practical joke的近义词，rascal）。