Explanatory composition

In study, work or life, everyone must have been exposed to composition. Composition is a narrative method that expresses a theme through words after people's ideological consideration and language organization. Do you know how to write a standardized composition? The following are three explanatory articles I collected for reference only, hoping to help you.

One day, my mother said to me, "Guess what I brought you?" I said, "I can't guess." Mom said it was a mimosa. Then he took out a pot of mimosa.

Mimosa is green, with four big leaves, two big leaves and two small leaves. The big one has 17 lobules, and the small one has 14 lobules. There is a round pink flower on it, which is as green as Xanthium sibiricum. The failed flowers and leaves soon fall. I also saw it like a pod.

When I saw the leaves, I suddenly remembered that I met the leaves of mimosa in the book. When I touched it hard, the branches drooped directly. I asked my mother why it was different from the book. My mother said I pushed too hard, so I touched it gently and the leaves closed as expected. I asked my mother again, "Mom, what are those things like pods?" Mom says it's a seed. When it's mature, you can give it to your classmates and it will grow out in a few days.

I thought, why do mimosa leaves turn back? I checked the computer, and it turned out that there was a bulging bag under the petiole of mimosa, called "leaf pillow", which contained enough water and felt very keen. When you touch its leaves with your hand, the water in the pillow immediately flows to both sides, and the pillow collapses and the leaves hang down (or close). Mimosa leaves not only when it is touched by hand, but also when it is rainy and windy. And when the water slowly recovers after the storm, the leaves will return to their original state.

Speaking of dogs, everyone should know. It is one of the most common animals in life and is affectionately called "the most loyal friend of mankind" by some people.

Dogs have two clever ears. Some dogs often hang their ears on their cheeks. As soon as there was movement, they stood up and listened carefully. It has a pair of black eyes, "gurgling" and looks bright. The dog's hair is smooth and comfortable to touch. This is because it often combs and cleans hair. Some dogs have tails as lovely as blooming chrysanthemums. Unlike a wolf's tail, it is bare, like a rope.

dog

Dogs also come in different sizes. Dogs like Chihuahua and Pomeranian are only as tall as small benches all their lives. But some dogs are different, such as Tibetan mastiff and Song Shiquan. They are tall and powerful, with four strong feet, almost as high as desks. There are many kinds of dogs, such as poodle, butterfly dog, poodle, China Sharp and so on. Dogs especially like to lie prone on the ground when sleeping, make a circle with their front paws, bury their whole face in the circle, and only show their ears. Why do dogs do this? It was to protect its nose. A dog's nose is very sensitive because it has a smell repository in it. As long as it asks something, it will never forget the smell. If you take an item for the dog to smell, and then hide it in a place where you think others can't, let the dog find it, and it will be found within an hour. Even if you take the dog a few kilometers away and leave it alone to go home, you can easily get it back.

It is precisely because dogs have sensitive noses that they can look after the house. Those dogs that watch the door for people are called "watchdog". Throughout the ages, there is no watchdog that does not unconditionally obey its master's orders. As soon as they smelled the smell of their master, they knew that he had come back, so they wagged their tails and ran out to welcome him home. They also rub their trouser legs with their bodies, which is especially clever. But when a stranger appeared in front of them, they smelled a strange smell and became alert. They quickly stood up, pricked up their ears and opened their eyes. As soon as you find a stranger doing something, you bark to attract the owner's attention and remind him.

Dogs can be trained as police dogs to help the police solve crimes. They have become a part of human life and are of great help to mankind. Therefore, we should love dogs. Not only because of its function, but more importantly, it is also a good friend of human beings.

In life, such things can be seen everywhere. It's a computer. Computers are as important as chains on bicycles. Without computers, the world can't run and move.

Science and technology are so advanced in our time that there are countless kinds of computers. The oldest is the big-headed computer, which is not easy to use, slow and unsightly; Very good is the LCD computer, the screen is big, the machine is thinner, but the host is too heavy; There are notebooks, which are small and exquisite for ordinary computers, and others are similar to ordinary computers; The best one is the all-in-one machine, which is not only light, with few wires and no host, but also can touch the screen by hand, which is very fast. I tried it myself, and it was very good!

The computer is so important because of its function. On the computer, we can play various games to entertain ourselves; You can also search for knowledge like the sea on Baidu, read and study, and search for weather, news, information, etc. You can also chat QQ online, video chat, keep a diary and watch movies with friends and relatives far away, which means you can't finish talking for three days and nights!

Every day, children always open their computers and play their own games. College students will use it to look up information and search for knowledge; Middle-aged people will use it to see the national situation, weather forecast and so on; Old people use movies to relieve their worries and boredom.

Computers work tirelessly and silently for people every day. At night, people fell into a sweet dream, the computer was turned off, they were relieved and fell asleep. ...