Part one ,as a preface, includes summarizing of theory and the object and method of study, and summarizes the relatable study, and finally poses the logic thinking and study hypothesis.

• 第一部分为绪论,包括理论综述以及研究的对象与方法,对以往的相关研究进行了梳理,并在此基础上提出了本文研究的逻辑思路和研究假设。