前言介绍白语的研究状况和本文的选题目的、意义和依据的理论与方法。
Preface introduces not only the aim and significance of choosing this topic, but also the theory and method this paper bases on.
本文由六个部分组成：绪论，介绍选题的依据，研究的意义、范围、现状、思路和方法。
This treatise is composed by six parts: Introduction. To introduce the basis, scope, status, ideas and methods of the study.
第一部分为绪论，主要是简单地分析了本文的选题依据、选题意义和相关文献综述等内容。
The first part is a brief introduction, analyzed the research basis and significance of the article, the research status, and so on.
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