Chinese is a basic course. Writing scientific sketches reflects the role of Chinese class in learning other subjects. Students sometimes have to write biology papers, physics papers and so on. As far as middle school students are concerned, what they write is mostly their own experience of a certain knowledge, that is, their understanding and application of a certain knowledge in combination with real life. This kind of article basically belongs to scientific sketches. This kind of exercises should explain the truth thoroughly, that is, they should be scientific and lively, which can be said to be art. To write scientific sketches well, we must use the skills of writing expository articles and appropriate rhetorical methods to impart a scientific truth in a simple way. Grasping the essence of things when writing scientific sketches. We often see a phenomenon in our life. If you want to tell others about this phenomenon, you must find out the reason. The appearance of a phenomenon is often the result of the interaction of several things. To write an expository article, we must first tell the phenomenon of things, be concise and closely follow the characteristics of things; Then write down the reasons for this phenomenon. When writing, you should be clear, easy to understand, grasp the key points and reveal the internal relations of things. For example, if you introduce a learning method to your classmates, you must first explain how you did it well and tell the effect of it, but these are superficial phenomena. Why does this work well? It embodies the relationship between knowledge and people's laws of thinking and memory, which is the essence of things. Only by writing out the steps and effects of this learning method and the reasons for its effects can it be convincing. Let's look at the following passage. Crops' friends are mostly citizens of the chemical kingdom, some from the family of elements, and some from the team of compounds. They are all builders and defenders of plant life. Among these friends, nitrogen, phosphorus and potassium are the most popular. These three brothers are the three treasures in fertilizer. Crops can't live without them just as they can't live without water and carbon dioxide. Without nitrogen, there would be no protein and life. If there is not enough nitrogen in the soil, the stems of plants will become short and weak, the leaves will turn yellow and the fruits will be reduced. Without phosphorus, the nucleus stops working and cells cannot reproduce. Without potassium, photosynthesis can't be carried out smoothly, and the resistance to pests and diseases will be weakened. Therefore, in order to increase crop yield, these three elements must be continuously supplemented. The above paragraph is selected from the discussion of Friends and Enemies of Crops. In the second paragraph of the quotation, it is explained that nitrogen, phosphorus and potassium can promote the growth of crops, which is a phenomenon of things. Then write the role of these three elements in the process of plant growth, reveal the relationship between these elements and plant growth, and write the essence of things. In this way, a story is told to the reader from the simple to the deep. We should learn and use this writing method to write clearly and profoundly what we have learned or experienced. Writing scientific sketches should be popular and vivid. Our physics, chemistry, mathematics and other textbooks tell us many scientific principles with concise language and thorough reasoning, which is different from scientific papers. The word "sketch" gives us an interesting feeling Therefore, scientific papers should not only be reasonable, but also be fascinating and fascinating. Scientific essays should be popular, and scientific truth comes from life. If we tell some truth in daily life, people will feel kind, natural and easy to accept. In order to be vivid and popular, we should use appropriate methods to compare familiar things. Make the characteristics of things leave a clear impression on readers. Understanding distant things from nearby things and understanding profound truth from simple phenomena can not only highlight the characteristics and essence of things, but also arouse readers' interest in reading, thus enhancing the intuition of articles. Using analogy can make the article vivid and make readers understand a certain truth from the simple to the deep. Look at the following paragraph. Overall planning method is a mathematical method to arrange the work process. It has a wide range of applications, not only in enterprise management and capital construction, but also in the organization and management of complex scientific research projects. How to apply? Mainly to arrange the working procedure. For example, I want to make a pot of tea. The situation at that time was: there was no boiled water; Wash the kettle, teapot and teacup; The fire is on fire. What about the tea? Method A: Wash the kettle, fill it with cold water and put it on the fire: while waiting for the water to boil, wash the teapot, wash the teacups and take tea; After the water boils, make tea. Method b: first do some preparatory work, wash the pot, wash the teapot and teacup, and get tea; Everything is ready, pour water to boil water, and wait for the water to boil to make tea. Method C: Wash the kettle, fill it with cold water and put it on the fire; Sit and wait for boiling water; After the water boiled, I hurried to find tea, washed the teapot and teacups and made tea to drink. Which way saves time? We can see at a glance that the first method is good and the latter two methods are "useless". This is a trivial matter, but it is an introduction that can lead to useful methods in production management. The above passage is selected from the explanatory article "Overall Planning Law". In the first paragraph, the author first defines the concept of "master planning method" with the following definition, and then explains its scope of application. The article writes that "enterprise management", "capital construction" and "organization and management of complex scientific research projects" are far from people's lives. Readers will feel that this is a complex scientific problem. But in the following, the author does not put forward one major project after another and a series of complicated figures, but leads readers to daily tea making. The author first wrote three arrangements for making tea. From the comparison of these three methods of making tea, the importance of the arrangement process is clear at a glance. These examples also laid a foundation for explaining the complex problem that key links must be grasped to improve work efficiency. This paper discusses the complex mathematical problems of engineering arrangement. The full text is like telling a family story, guiding everyone how to grasp the time in life. Just as the author said, it is nothing more than drinking water, eating and walking, but it falls on the high theory of "mathematical method of arranging work process" everywhere. The daily phenomenon written in this article expounds the complex and profound truth, which makes people feel cordial and clear-headed.