The author starts with the mature content, and then writes the rest after considering maturity or further research. The subsection writing method means that the author starts from the first consideration of mature content, completes this paragraph first, and then considers maturity or further research before writing the rest. This writing method can ensure that the author's ideas are not interrupted and avoid redundancy and repetition. In the process of writing the first draft of the paper, the subsection writing method helps the author to better organize ideas and materials and ensure the clarity and integrity of the paper structure. Specifically, the author can start writing from the core chapter of the paper, discuss and demonstrate step by step, and constantly improve and supplement the content of the paper. This writing method is helpful to improve the quality and level of the paper and make it more rigorous, complete and convincing.