Devote 1-2 pages to this. No extra reading needed here: derive from class lectures and discussions, assigned readings and other sources of information that you may already have.

• 请用1-2页篇幅作简介,无需额外阅读资料:请自课堂演讲与讨论,指定阅读材料及其他已经拥有的资讯著手