Chapter structure refers to an article or paper, the main content is divided into several chapters, each chapter has its own theme and content, and there is a certain logical relationship between these chapters, which constitutes the framework structure of the whole article.

The central problem refers to the core problem or theme of an article or paper, and can also be understood as the central idea or theme of an article or paper. In the process of writing, we should make clear the central topic, so as to run through the theme in the article or thesis and avoid deviating from the theme or disturbing the content.