1, research background
The research background is to ask questions and explain the reasons for studying this topic. The research background includes theoretical background and practical needs. It is also necessary to summarize the research status of similar topics at home and abroad: ① What are people studying and to what extent? (2) Find out what you want to learn but others haven't done yet. (3) What others have done, you think it is not enough (or defective), and put forward perfect ideas or measures. Others have done it, so you have to do another experiment to verify it.
2. Purpose and significance
Purpose meaning refers to what problems will be solved (or what conclusions will be drawn) through this research, and what is the significance of solving this problem (or drawing conclusions). Sometimes the research background and purpose are combined into one.