The central idea of the article refers to the main idea and core content that the article wants to express. It is the soul and main idea of an article. It usually appears in the first paragraph or sentence of the article, which outlines the theme and focus of the entire article. The central idea is usually the most important content in an article. The reader can grasp the core content of the article by reading the central idea, so as to better understand the meaning and value of the article.