1. research background and purpose: briefly introduce the theme, field and purpose of this study.

2. Research methods: Explain the research methods, data sources and sample selection methods adopted in this study.

3. Research results: Summarize the main conclusions and findings of this study, including data and experimental results.

4. Conclusion and significance: Summarize the main conclusions of this study, and explain the significance and value of this study, as well as its contribution and enlightenment to related fields.

5. Keywords: List 3-5 keywords related to the research topic to facilitate readers' search.

It should be noted that the abstract should be concise, highlight the main contents and conclusions, and generally not exceed 300 words. It is the essence of the whole paper and an important reference for readers to understand and choose the paper. Therefore, the abstract should follow academic norms and formats, be written independently, and should not contain any information not mentioned in the text.