Four elements of abstract: 1. Objective: Purpose mainly refers to the scope and purpose of the research, as well as the importance and tasks, as well as the preconditions, and is not a simple repetition of the subject; 2. Methods: It is necessary to briefly state the specific content of the research and what work has been done in the research process, including the research objects and principles, as well as the research conditions, procedures and means. 3. Results: State the new findings and achievements after the research and the value of the paper, including the data and results obtained through investigation, experiment and observation; 4. Conclusion: Conclusion mainly refers to the important conclusions drawn through individual research, mainly including the correct viewpoints obtained from the research and the significance of application in real life, which is the value obtained by combining theory with practice.