2. Introduction refers to a part of a book or the beginning of a paper, explaining the theme and content. Any article always has a beginning, and the beginning of a dissertation usually needs a preface (preface, preface, introduction, preface, etc. The task of the preface is to explain your topic, the main direction of the paper, the process and situation of document retrieval (that is, what the predecessors have done in this regard), what innovations (or arrangements) your paper has, the research methods used, and the general structure of the paper.
3. This part is indispensable in a standardized paper. In general, the content of "Introduction" should at least include the value and significance of the selected topic, literature review, the ideas, materials and methods of this paper, the main contents and logical arrangements of each chapter, etc. Thus, it shows the difference between this study and the existing achievements, emphasizes the uniqueness of this study in materials and methods, and the basic idea of writing the full text, so that readers can better grasp the full text and stimulate their reading interest.
4. As the beginning of the paper, the introduction briefly introduces the writing background and purpose of the paper, the origin and realistic requirements of the research, as well as the preliminary work and research survey in related fields, and explains the relationship between this research and the preliminary work, research hotspots, existing problems and the significance of the author's work, which leads to the theme of this paper to guide readers.