The first sentence that attracts readers. The introduction should be close to the title, but not a repetition of the title. It can be a thought-provoking question, an emotional sentence, or a shocking data. It is an opening that attracts readers to read on. Introductions and abstracts are both the appearance of articles. Articles include books and works in various literary styles, such as poetry, drama, novels, scientific papers, narratives, argumentative essays, explanatory essays, practical essays, etc. "Articles through the ages have not exhausted their talents" and "articles through the ages "Things", "Articles are destined to be fulfilled", "I have to sit on the bench for ten years, and the article is not a word", "Piling up sentences becomes a chapter, accumulating chapters into a chapter", "Speaking to make an argument, writing becomes a chapter", etc. are all what we are talking about now. The meaning of article in a broader sense also includes the meaning of "knowledge" and "mystery", such as "Everything in the world is knowledge, and understanding of human feelings is article" means that the basic elements of an article are theme, material, structure, and language. It is the main research object of article studies. Various writing treatises have discussed it in detail in the past, but the revelation of its conceptual connotation seems to have been poorly thought out and the definition is not strict.