Based on the current research situation, this paper analyzes the current research results, and then expounds the problems that this topic wants to solve.
Selection skill
1. background: briefly introduce the basic concept and background of the problem studied in this paper, what is the original intention of the topic, and why is there such a topic?
2. Significance of subject research: briefly explain what the subject research has promoted in this field and what achievements can be achieved through research, which can be repeated in the section "Problems to be studied and solved".
3. Research status at home and abroad: What kind of research status is the subject research at present, and what relevant research results are there at home and abroad, especially the research literature in recent years, must be listed more. Through the study of the current situation, we can draw out the content to be studied next.