First, to grasp the characteristics of things, whether an explanatory article is well written depends mainly on whether it grasps the characteristics of things and whether it makes readers get a specific and clear understanding. For example, if you visit the zoo, you should introduce giraffes to young readers. What are the main characteristics of giraffes? Fast running and beautiful stripes are not the unique characteristics of giraffes. The main feature of 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 five meters seven or eight. 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 giraffe's seven cervical vertebrae are lined up, which is its long neck. The length of each cervical vertebra can be imagined. Only by writing these clearly can we grasp the main characteristics of giraffes and be regarded as a better exposition. Otherwise, you don't understand. So, how to grasp the features? First of all, observe carefully. The article is a reflection of objective things, and only by in-depth and careful observation can we understand things clearly. Liu Wei, a student from No.7 Middle School in Zhengzhou City, Henan Province, wrote an expository article introducing Pink Butterfly, in which the species, forms and living habits of pink butterfly, why pink butterfly can't fly in the morning and what harm it does to crops are clearly written 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 has a strong interest in biology at ordinary times, and he can practice it himself and observe it carefully. In two years, he made more than 400 specimens, including more than 300 specimens of Papilio glabra, and there are five or six kinds of * * *. When talking about his experience, he wrote: "The individual of insects is very small, especially the head structure is difficult to observe. I borrowed a magnifying glass from my teacher, and I observed a wide range of things, including butterflies, bees, locusts, dragonflies, mosquitoes, flies and so on. There are willow leaves, phoenix leaves, elm leaves, locust leaves, etc., as well as grass leaves and flowers and trees ... I often take a magnifying glass, pen and notebook with me, and take time to make some observations when I go to school and go to the park to play, and write down the main observations. " Secondly, we should consult the information. We can't experience everything personally, and the explanatory text requires accurate features and informative materials, which requires consulting relevant materials and verifying them with the experience summarized by previous people. For example, a middle school student studying in Changsha traveled to Beijing and visited the Forbidden City, and wanted to introduce him to his classmates. So, he not only wrote down the impression of his visit, but also bought a "Travel Map of the Forbidden City" and a "Top Ten Places of Interest in Beijing" to learn about the history, geographical location and architectural characteristics 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 China, with a history of more than 500 years. The whole Miyagi is rectangular, covering an area of 720,000 square meters, with more than 70 palaces and more than 9,000 houses. Surrounded by a wall more than ten meters high, outside the wall is a moat more than fifty meters wide. On the four corners of the city wall, there is an exquisite turret. The Forbidden City complex is large in scale and unified in layout. In the early years of the Ming dynasty, in order to build this Miyagi, we used to' serve 100 thousand craftsmen and millions of laborers.' The Forbidden City is the crystallization of the sweat and wisdom of the working people in ancient China. "These specific figures and architectural features mentioned above are naturally difficult to master without consulting the necessary information. Finally, learn to compare. Things in the world are very different, and different things have different characteristics, even one kind of things has its own characteristics. There are no exactly the same two leaves in the world. Twin brothers, no matter how similar they look, can be distinguished. Grasping the characteristics of things means grasping the different characteristics that distinguish this thing from other things, finding individuality from * * *, and finding particularity from the general. The characteristics of things are often shown in comparison with other things. For example, to show that China is a big country, the word "big" is very learned. You can directly say that China has an area of 9.6 million square kilometers, or you can use a comparative method to illustrate it. Compared with France, the area of China is seventeen times larger than that of France. Compared with Japan, there are twenty-five Japan; Compared with Britain, there are thirty-nine Britain; The area of our motherland is equivalent to the whole of Europe. Such a comparison is concrete, vivid and convincing. In short, we should grasp the characteristics of the explanatory object, on the one hand, rely on personal practice and careful observation, on the other hand, we should be good at learning from books and experienced people, and at the same time, we should think carefully. Learn to compare and try to be familiar with what you want to explain.

shaddock

Cucumber trees bear cucumbers. Cucumber bellies contain cotton, cotton bellies contain combs, and combs contain bean sprouts. "Do you know what this is? It is grapefruit.

Pomelo, among many autumn fruits, is the largest, generally above 1 kg. It ripens around the 15th day of the eighth lunar month every year, with thick skin and can be stored for three months without losing its fragrance, so it is called "canned natural fruit". Pomelo is round in shape, symbolizing reunion, so it is also a suitable fruit for Mid-Autumn Festival.

The skin of grapefruit is lemon yellow. When you smell it, a faint fragrance comes to your nose. Touch it, the surface is not very smooth, and there are many small yellow-green pimples as big as rice grains. Just like in the riddle, cut the thick skin of grapefruit and expose a thick white film first. Take off the tightly wrapped coat again, only to reveal the petals of pulp. The long, thin and shiny pulp is tightly packed together, which is very attractive. Break off a small piece and put it in your mouth, and suddenly a sour and sweet taste fills your mouth, which is memorable.

Pomelo is produced in Fujian, Jiangxi, Guangdong, Guangxi and other southern regions of China. There are many kinds of pomelo, Shatian pomelo has the earliest planting time in China, and it is also the largest variety of pomelo in China. The fruit is pear-shaped or gourd-shaped, with a single fruit weight of 500 ~1500g, an edible rate of 40% ~ 60% and a juice content of 30% ~ 40%. Every 100 ml contains 0.0.6 g of total acid and 0/00 ~ 200 mg of vitamin C. Fruit1early October ~11mid-month ripens.

Pomelo has a high nutritional value, which contains many vitamins, protein, carotene, calcium, phosphorus, potassium and other essential elements for human body. The vitamin C content in pomelo is much higher than that in other fruits. The vitamin C content in pomelo meat per 100g is 57 mg, which is10 times that of pear, which is incomparable to other fruits. Pomelo is not only nutritious, but also has medicinal value. Grapefruit can also reduce blood viscosity, especially suitable for middle-aged and elderly people.

Pomelo is not only good for fruit, but also has a great function. Pomelo peel is warm and has the effects of resolving phlegm, relieving cough, regulating qi and relieving pain. Boiled water with grapefruit peel can cure children's pneumonia, chilblain, stir-fry and drive away mosquitoes at home ...

Grapefruit is really good! However, no matter how good it is, you can't be too greedy!