Preface is also called "preface", "preface", "narration", "thread", "quotation" and "rumor" written in front of a book or an article. The preface of the book, published before the text, mainly explains the basic content, compilation (translation) meaning, writing process of the book, academic value and translator's introduction. Written by translators, editors or others. The preface in an article is usually used to explain the main idea or purpose of the article. It can also be understood as the essence of what is written.

Introduction to the thesis

The preface of the paper is also called introduction, which is a short paragraph in front of the text. The preface is the preface of the paper, which aims to explain the ins and outs of this study to readers, arouse readers' interest in this paper, and play a role in outlining and guiding reading interest in this paper. Before writing the preface, we must first clarify several basic questions: What do you want to explain through this article? What are the new discoveries and whether they have academic value? After reading the preface, the general reader can clearly know why the author chose this topic for research. Therefore, before writing the preface, we should know as much as possible about the relevant contents, collect the main data of predecessors and others' work, and explain the rationality of this study.