Thinking of writing: We should choose the topic by finding out the shortcomings and mistakes of previous studies. Many of the research topics put forward by predecessors have achieved initial research results, but with the continuous development of society, they still need to be enriched, improved and developed. This supplementary or revised research topic also has scientific value and practical guiding significance.

After writing this paper, I learned a lot of useful things and accumulated a lot of experience. However, due to my lack of knowledge and ability, coupled with limited time and energy, I feel that there are still some shortcomings: many contents are improperly expressed and discussed, which is far from the expectations of teachers.

My thesis tutor is a rigorous and demanding tutor. During the formation of my thesis, I was strict about the content, structure, text expression and even punctuation, but I didn't do enough in some aspects. Many problems need further thinking and exploration. I would like to take this opportunity to reply, and sincerely hope that all teachers can put forward valuable opinions.

Point out my mistakes and shortcomings, and I will accept them with an open mind, so that I can continue to study and study further and improve my thesis. The above is my brief statement of the paper. Please ask your questions. Thank you!