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, Richard Boston’s Book of practical jokes is briefly introduced. The key part of this episode is to learn the Appositive Clause. 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。第三讲简单介绍书《恶作剧》。主要讲解本单元语法重点——同位语从句，并与定语从句进行了对比。相关词语辨析和讲解。