Literary expository: Pay more attention to vividness and interest when introducing and explaining things, and use more descriptive methods such as imitation, analogy, personification, quoting ancient poems and legends to make the article more vivid and more attractive to readers. This method is often used in general science fairs. For example, the first paragraph of China Stone Arch Bridge and the first and second paragraphs of Language of Nature.
Scientific explanation: plain writing, concise language, accurate and appropriate explanation of things or things. Common examples, definitions, figures, charts, explanations, classifications, etc. This method is usually used for general scientific and technological explanations, instructions for use and plot summaries. For example, two essays by Asimov.
This difference is only relative. There can be simple explanations in literary discourses and vivid explanations in scientific discourses.
2. According to the object of explanation, it is divided into: things explanatory text (such as the third unit of the first volume of the eighth grade) and things explanatory text (such as the fourth unit of the first volume of the eighth grade).
3. There is also a kind of explanatory text that introduces the procedures and methods of handling affairs called "program explanatory text". Such as "overall planning method" and various recipes.