Explanatory writing at the beginning: quote famous sayings or cases, ask questions, briefly describe the theme, introduce the background, and list facts or data.

1. Quote famous sayings or cases: Quoting famous sayings or cases related to the theme can quickly arouse readers' interest, and at the same time, it can pave the way for the following content.

2. Ask questions: Asking questions at the beginning can immediately arouse the reader's curiosity and guide the reader to continue reading and get into the theme of the text.

3. Briefly describe the theme: A brief description of the theme at the beginning can quickly let readers know the central idea of the article and lay the foundation for the following content.

4. Introduce the background: Introducing the background at the beginning can provide readers with background information related to the theme and help readers better understand the following content.

5. list facts or data: listing facts or data at the beginning can immediately attract readers' attention and also provide support for the following content.

According to the object of description, the description of things: The description of things aims to introduce the physical characteristics of something, such as "The Story of the Nuclear Boat" and "Dinosaur". Chinese textbooks include Chinese Stone Arch Bridge, Underwater World, Suzhou Gardens, Seeing the Clouds and Knowing the Weather, and so on.

Explanatory essays: Explanatory essays aim at explaining the truth or internal laws of things, such as "Fear of Nature" and "Language of Nature". Like the procedural exposition, understand things. You can understand the truth of things by observing and studying in person or consulting materials.