Just write an explanatory essay

1. Grasp the characteristics of things. Whether an expository essay is well written mainly depends on whether it captures the characteristics of things and whether it enables readers to gain a specific and clear understanding. For example, you visited the zoo and wanted to introduce giraffes to your young readers. What are the main characteristics of giraffes? Running fast and having beautiful markings are not unique characteristics of giraffes. The main feature of the giraffe is its long neck. It is the tallest animal in the world. The female deer is more than four meters tall, and the male deer is about five meters tall. The highest record is 5.78 meters. It has four thin and long legs and a particularly long neck. Surprisingly, it has only seven cervical vertebrae, the same number as human cervical vertebrae. The seven cervical vertebrae of a giraffe are lined up to form its long neck. The length of each cervical vertebrae can be imagined. Only by writing these clearly can we capture the main characteristics of the giraffe and call it a better explanatory article. Otherwise, you won’t understand. So, how to capture features? First, observe carefully. Articles are reflections of objective things. Only by in-depth and careful observation can we understand things clearly. Liu Wei, a classmate from No. 7 Middle School in Zhengzhou City, Henan Province, wrote an explanatory essay introducing "White Butterfly". In the article, he wrote about the types, shapes, and living habits of the white butterfly, why it cannot fly in the early morning, and what harm it does to crops, etc. Clear and well-founded. This expository article has been selected as a teaching material by some schools. Why can Liu Wei write such a good article? This is because he usually has a strong interest in biology and can practice it himself and observe carefully. In two years, he made more than 400 specimens, including more than 300 white butterfly specimens alone, including five or six species. When talking about his experience, he wrote: "Insects are very small, especially the head structure is difficult to observe. I borrowed a magnifying glass from the teacher, and I observed a wide range of things. Among the insects, there are white butterflies, bees, locusts, Dragonflies, mosquitoes, flies, etc.; plant leaves include willow leaves, sycamore leaves, elm leaves, locust leaves, etc., as well as grass leaves and flowers and trees... I often carry a magnifying glass, pen, and notebook with me on my way to and from school. , take time to make some observations when you go to the park, and write down the main observations. "Secondly, check the information. We cannot experience everything personally, and the explanatory text requires accurate features and detailed materials. This requires consulting relevant information and relying on the experience summarized by predecessors to confirm it. For example, a middle school student studying in Changsha traveled to Beijing and visited the Forbidden City, and wanted to introduce it to his classmates. Therefore, he not only recorded his impressions of the visit, but also bought a "Forbidden City Tourist Map" and a "Top Ten Scenic Spots in Beijing" to learn about the history, geographical location and architectural features of the Forbidden City. In this way, he knew: "The Forbidden City, also known as the Forbidden City, is the imperial palace of the Ming and Qing dynasties in my country, with a history of more than 500 years. The entire palace is rectangular, covering an area of ??720,000 square meters, and there are seven large and small palaces. There are more than ten buildings and more than 9,000 houses. It is surrounded by a city wall more than ten meters high. Outside the wall is a moat more than fifty meters wide. There is an exquisite and ingenious turret on each corner of the city wall. The layout is unified. In the early years of the Ming Dynasty, one hundred thousand craftsmen and one million servants were used to build this palace. The Forbidden City is the crystallization of the blood, sweat and wisdom of the ancient Chinese working people. "The specific numbers and architectural features mentioned above. , without consulting the necessary information, it is naturally difficult to master. Finally, learn to compare. Things in the world vary widely, and different things have different characteristics. Even the same type of thing has its own characteristics. There are no two absolutely identical leaves in the world. Twin brothers, no matter how similar they look, can still be distinguished. Grasping the characteristics of a thing means grasping the different characteristics of this thing from other things, discovering individuality from uniqueness, and finding specialness from generality. The characteristics of things are often revealed in comparison with other things. For example, if you want to explain that China is a big country, the word "big" is very knowledgeable. You can directly say that China covers an area of ??9.6 million square kilometers, or you can use a comparative method to explain. Compared with France, China's area is 17 times larger than France; compared with Japan, it is 25 times larger than Japan; compared with Britain, it is 39 times larger than Britain; the area of ??our motherland is equivalent to the entire Europe. Such a comparison is both concrete, vivid and convincing. In short, to grasp the characteristics of the object of explanation, on the one hand, we must rely on personal practice and careful observation, on the other hand, we must be good at learning from books and experienced people, and at the same time, we must think carefully.

Learn to compare and try to be familiar with the things you want to explain

Grapefruit

Cucumber trees bear cucumbers. The cucumbers are filled with cotton, the cotton is filled with combs, and the combs are filled with bean sprouts. ."Do you know what this is? It is grapefruit.

Pomelo is the largest among many autumn fruits, usually weighing more than 1 kilogram. It appears in the lunar calendar every year It matures around August 15th and has a thick skin that can be stored for three months without losing its fragrance, so it is known as "natural canned fruit". The round shape of grapefruit symbolizes reunion, so it is also a suitable fruit for the Mid-Autumn Festival.

The outer skin of grapefruit is lemon yellow. When you smell it, a light fragrance comes to your nose; when you touch it, the surface is not very smooth, and there are many small yellow-green bumps as big as rice grains. Like It's the same as the riddle says. Cut open the thick skin of the grapefruit, first revealing a thick white film; then peel off the tightly wrapped coat, revealing the petals of the pulp, the thin and long shining. The shiny flesh of the fruit is densely packed together, which is very tempting. Break off a small piece and put it in your mouth. Suddenly, a sweet and sour taste fills your mouth, which is endless aftertaste.

Pomelo is produced in southern my country such as Fujian, Jiangxi, Guangdong, and Guangxi. There are also many types of pomelo. Shatian pomelo is the earliest and oldest planted in my country and is also the pomelo variety with the largest production and sales in my country. The fruit is pear-shaped or gourd-shaped. shape, a single fruit weighs 500 to 1500 grams, the edible rate is 40% to 60%, the juice content is 30% to 40%, and each 100 ml contains 0.0.6 grams of total acid and 100 to 200 mg of vitamin C. The fruit is from early October to It matures in mid-November.

The nutritional value of grapefruit is very high. It contains a variety of vitamins, proteins, carotene, as well as calcium, phosphorus, potassium and other essential elements for the human body. The vitamin C content in grapefruit is much higher than other Fruit, every 100 grams of grapefruit meat contains 57 mg of vitamin C, which is 10 times that of pears. This is unmatched by other fruits. Pomelo is not only rich in nutrients, but also has high medicinal value. Traditional Chinese medicine believes that grapefruit tastes sweet and sour. , cold in nature, has the effects of regulating qi and reducing phlegm, moistening the lungs and clearing the intestines, nourishing blood and strengthening the spleen. Regular consumption of grapefruit can also lower blood sugar, lower blood lipids, lose weight, and beautify the body; grapefruit can also reduce the viscosity of blood, which is especially suitable for middle-aged and elderly people. .

Grapefruit is not only good as a fruit, but also has a great effect on the peel. Pomelo peel is warm in nature and has the effects of resolving phlegm, relieving coughs, regulating qi, and relieving pain; boiling grapefruit peel in water can cure pneumonia in children, frostbite, Cooking vegetables and keeping them at home can repel mosquitoes...

Grapefruit has so many benefits! However, no matter how good it is, don’t be too greedy!