Invent a 300-word composition.

1. Write 300 words of articles on gizmos 7 articles on my gizmos 300 words (1) This morning, I was doing my homework at home, and I made several mistakes. I picked up the eraser and wiped it, leaving a lot of dirty things on my homework immediately. What should I do with these crumbs? So I thought of inventing a little invention to deal with rubber crumbs.

But what kind of things should be made to deal with these debris? I was thinking hard at my desk, but I couldn't remember it. I paced back and forth in the room, thinking about this problem. At this moment, I saw a broom and dustpan in the corner. They can clean things on the ground, and I can make a "clean eraser" like them. How? I've been thinking, and I had a brainwave and came up with a good idea.

My idea is to add a broken brush to one end of the eraser, so that there will be no rubber crumbs after wiping with the brush. Production has begun. I first dug a hole at one end of the rubber, neither deep nor shallow.

Next, put the brush in the hole and stick it with glue. If you are still afraid of cracks in the eraser, glue it with transparent glue for several times, so that you can make a small, convenient and practical clean eraser.

Dry it and you can "put it into use" A clean eraser can erase type without leaving rubber foam. This is killing two birds with one stone.

How's it going? Is the clean eraser I invented not good? It seems that as long as we are willing to use our brains and be brave in practice, each of us will create something. Every time I play with a toy car, I always find that I have to push it by hand and I can't run far.

I think: we must find a way to let the car run away by itself. One day, I was playing with balloons and accidentally let them fly. Balloons flew everywhere. I had a brainwave and thought: tie the inflatable balloon to the back of the car, then let go, and the outward airflow will not push the car forward! At first, I took the tools, tied the balloon to the car, blew, let go, shouted, shouted, huh? Why doesn't the car go ahead? Oh! It turns out that I turned the air outlet of the balloon upside down.

Failure is the mother of success, so I hurried to do the second experiment. I tried and corrected again and again ... haha! Finally finished! Let me try that one more time. This time, my heart and blood were not in vain, and the car drove forward happily.

This incident made me understand a truth: you should use your brain and heart to do everything, and you can't give up halfway. Grade 3: Wu Yunxi's composition about my invention is 300 words (Chapter 3). I want to invent a micro notebook computer.

It is only the size of a palm, and all the knowledge in the world is in it. What books do you want to read? Just turn on the computer, indicate the title, and you can read it.

You can also study here. You can choose a text that you can't learn, enter the past topic, and you can learn it and remember it firmly. In it, you can also watch informative TV and jokes, so that you can learn knowledge in happiness.

With a micro laptop, teachers don't have to give lectures. We get full marks for everything. This kind of computer looks ordinary, like a thin piece of paper.

The operation method is also very simple. There is a pen next to the computer. When you open it, use it to manipulate it. If you want to enter a word, touch the computer with the pen tip and press it gently, just like a big computer.

The advantage of this kind of notebook computer is that you don't need to put it in your pocket after you turn it off, and it is light in weight and not easy to be found. Take it out and open it when necessary.

Although this invention is difficult, I am confident that I can find this kind of computer through my hands when I grow up. At that time, you must go and see it! My invention composition is 300 words (the fourth article). Today, I made a little invention.

I invented a piece of calligraphy paper. That's no ordinary study paper! It consists of words unknown in the dictionary, and it is also marked with Pinyin.

It is made of white paper, cardboard, labels and markers. Each line 10 words, one * * * five lines.

Let's all make our own gizmos, shall we? Maybe even win a prize! Teacher's comment: The little author is a thoughtful child. It is very convenient to make unknown words into plates, so that you can learn to read words at ordinary times and deepen your understanding of these words in the process of making.

However, it is not enough to know the shape and pronunciation of Chinese characters. Can you mark the meaning on them, too? The production process described by the author is a bit simple. Can you add something, such as how did you come up with the idea of doing a study paper and how did you do it? Whether something interesting happened in the process of doing it can increase the interest and vividness of the description, and you can also use what the author learned on the study paper. My invention composition is 300 words (the fifth article) "Hello! Dad, I'm at school! " At this time, you may wonder why all primary school students have mobile phones. Oh, I forgot to tell you, this is the pencil case in the super stationery I invented.

This pencil box is different from other pencil boxes. There is a small box on the upper right. This small box is a microcomputer, which can store text information. Words that can't be written will appear as long as they are lightly touched. What's even more amazing is that you can make a phone call. Just say the phone number and it will become a videophone.

Open the pencil case, which contains all kinds of stationery with their own characteristics. As far as mechanical pencil is concerned, no matter how many refills you use, it can still be sent out because it has the ability to make its own refills; Except for the pen, it always seems to have endless ink; The ruler is even more remarkable, although it is only 20 cm long in the pencil case. If you want to extend it, it can reach 50 cm, which is long enough. There is also a ballpoint pen, with two small lights on both sides, which can help you with your homework even at night when there is a power outage; Finally, the eraser, ordinary eraser can only erase pencil words, but also erase ink such as pens and ballpoint pens.

This is super stationery I invented, not bad! Everyone in my invention has great ideals, and if you want to realize them, you must start with small things. In order to realize my dream, I began to use my brain and make some small inventions ... When watching TV today, I saw some decorative ornaments made by some people on TV and thought: Can I do better than them? Sure！ I am one of them.

About 2.300 words to introduce your invention, 350 words to introduce your invention composition.

One Sunday, I finished the homework assigned by my teacher and picked up a book at home to read when I was idle. Suddenly, I saw the lid of the kettle keep jumping. I poured water into the thermos, and suddenly an idea flashed through my mind. If the water boils and I can't see it, won't the kettle melt? Our family once burned a kettle because the whole family was not at home at that time. I have to find a way to prevent the kettle from melting. I had a brainwave. If you tie a bell to the lid of the kettle, then tie a small rope to a nail, and then nail the nail to the wall, won't the bell ring when the water boils?

I'll do it first and see if I can succeed. I mean it. I'll do it in order. First, I will tie the bell to the pot cover, then nail the nail to the wall, and then I will hang a thin and long rope on it. I put the water in the pot. After a few minutes, the bell really rang and the wire was not broken. I jumped up and down happily and told my father my little invention. Dad said with a smile. Hearing my father's praise, my heart is as sweet as honey. Since then, my kettle has never melted.

From this incident, I understand a truth: it is not easy to achieve excellent results, and it takes effort. Whatever you do, you can't give up halfway. You will succeed as long as you are patient.

3. My invention composition is 300 words. After school, I will have a look at my invention-wind chime, which was made in my fourth grade summer vacation.

It was the summer vacation of grade four, and I had finished a lot of homework. It's just that the small production of this homework makes me nervous. Once, I accidentally saw a box of expired "Sanjing Brand Blue Bottle Oral Liquid" in the living room. I went over curiously and opened it. Full, I only drank one bottle! I want to drink these delicious oral liquids, but they have expired. What if you are embarrassed to throw it away? I had a brainwave: "I can dump the expired oral liquid in the bottle and collect the bottles outside to make a beautiful wind chime!" " " .

To start, I'll take the bottle out of the box first, stab a small hole in the bottle with scissors, then put the bottle down and let the oral liquid pour out bit by bit. After all the oral liquid was poured out, I put the bottle on the table. Find out some cardboard and double-sided tape that are not used in art class from home, and find out tools such as wool and scissors. After everything is ready, production will officially start.

My mind flashed a lot of wind chimes I had seen in the store, but I just didn't know what to do. I found a lot of art books, and finally found the "underwater world" wind chime in the art books of grade three. My mother and I discussed it for a long time and decided to do it.

I cut a blue cardboard into a circle, then cut off an acute angle on the circle, and then glued the two sides of the corner just cut off with double-sided tape, thus forming a funnel shape. Next, we will make pendants. Pendants are all kinds of underwater creatures. I drew a big crab on a piece of red cardboard, holding big and powerful feet and bulging eyes. It looks awesome! I cut it carefully with scissors. Cut a big, fat carp and a small turtle with a thick shell ... and prepare some wool of different lengths and colors and stick one on each creature's back. The second is to hang a bottle under each creature, which makes me wonder. How can I hang the bottle firmly on it? It's not nice to put it directly on the bottle mouth, and the bottle is glass, so you can't make a small hole. What should I do? I looked at the bottle in a daze. Suddenly, my eyes fell on the toothpick on the table. I had a brainwave and came up with a good idea. I divided the toothpick into two sections, picked up one section, tied it in the middle with wool, put the toothpick obliquely into the bottle mouth and lifted the wool. The bottle hangs steadily. I hang all the bottles in the same way. Finally, all the wool connected with the creature and the bottle passes through the center of the funnel and is twisted into a strand. Such a beautiful wind chime is finished. I showed it to my mother, and she loved it. She praised my good work and hung it in the living room with me.

4. My invention composition 300 words My invention Everyone has great ideals, and if you want to realize them, you must start with small things.

In order to realize my dream, I began to use my brain and make some small inventions ... When watching TV today, I saw some decorative ornaments made by some people on TV and thought: Can I do better than them? Sure！ I can do it well! At this time, I began to prepare materials. I searched and searched for a long time, and turned my house upside down, only to find a piece of white yarn and some colored threads.

Having prepared the tools, I began to make decorations. First of all, I folded the gauze in half, sewed the other three sides with a needle, found a piece of paper as big as the gauze, drew a picture on the paper with a colored pen, put the paper into the gauze and sewed the gauze.

Then, I drew a beautiful picture on the other side of the gauze with a colored pen, and then I sprayed perfume on it. Finally, I tied the numbered one to the gauze and hung a bell under it. In this way, a sachet is ready.

Look! This is my little invention! Does it look nice? .

5. My third-grade 300-word invention. On summer nights, annoying mosquitoes always bite people, suck human blood, spread diseases, and keep buzzing, which makes people unable to sleep well. I want to invent a special mosquito-killing perfume.

This perfume, made of special materials, can give off a particularly strange fragrance. As long as mosquitoes smell this fragrance, they will immediately lose their attack ability and fertility. Now they can't even suck human blood, let alone breed, and they will infect each other. Over time, mosquitoes will gradually become extinct.

This mosquito killer can not only kill mosquitoes, but also be effective against pests such as flies, cockroaches and bedbugs. But it is harmless to human beings and their friends-poultry, livestock and beneficial insects. Why is this? Because in the process of perfume production, we extracted the genes of the four pests and mastered the "life gate" of the "four pests", so the perfume made is particularly targeted and will definitely become a "super secret weapon" to kill the "four pests" in the future!

Having said that, you may ask, how to make this perfume? Hehe, I can't tell you now, my perfume is in the trial production stage! When I apply for a patent and put it into mass production, you can buy it everywhere.

Everyone has lofty ideals, and if you want to realize them, you should start with small things.

In order to realize my dream, I began to use my brain and make some small inventions. ...

Today, when I was watching TV, I saw some decorations made by some people on TV, and I thought: Can I do better than them? Sure！ I can do it well!

At this time, I began to prepare materials. I searched and searched for a long time, and turned my house upside down, only to find a piece of white yarn and some colored threads. Having prepared the tools, I began to make decorations.

First of all, I folded the gauze in half, sewed the other three sides with a needle, found a piece of paper as big as the gauze, drew a picture on the paper with a colored pen, put the paper into the gauze and sewed the gauze. Then, I drew a beautiful picture on the other side of the gauze with a colored pen, and then I sprayed perfume on it. Finally, I tied the numbered one to the gauze and hung a bell under it. In this way, a sachet is ready.

Look! This is my little invention! Does it look nice?

6. How to write my invention 1 in my invention composition? I want to invent a miniature house most. Because many people in our lives are alone, we can't let go when we go out for a long time. A miniature house will solve this problem for you. This miniature house is a model house. It is very small, only a quarter as big as the palm of your hand. This is very simple to use and takes up little space. You don't have to worry about it disappearing. Because if you accidentally lose it, it will send out an abnormal fluctuation, and only the owner of that small house will hear and see it. If someone finds it and wants to keep it for himself, and the instrument that sends it fluctuations is broken, don't be afraid, because only your own remote control can open the miniature house. Other remote controls cannot be turned on. I hope this kind of room can bring convenience to everyone. There is a remote control in the miniature contraction room. There are seven buttons on the remote control, and the colors of the buttons are different: red, yellow, blue, green, blue, red and purple. These seven keys are: absorbing carbon dioxide, turning on lights, turning off lights, keeping warm, cooling down, networking and shielding. People can. If an explorer climbs the cliff, how can the house settle down? What if an area is very hot or cold? How can I surf the Internet without a network cable? What if the beast appears in Shan Ye? Don't be afraid of these questions. Because you have a mysterious remote control, you can save energy by pressing the red button on the remote control. The main energy in the house is carbon dioxide, so you don't have to waste energy. As long as you press King Wong, the lights will turn on automatically, but the lights in other places will not turn on except your room. As long as you press the blue button, the light will go out. As long as you press the green button, the house will close. This way, you don't have to suffer from severe cold when you go out in winter. As long as you press the green button, the house will become very cool, so you don't have to face the summer heat. As long as you press the red button, the computer will automatically connect with the telecom. As long as you press the purple button, there will be a transparent protective cover next to your home to protect you from wild animals. Although this is just an idea, one day, I tried to invent the miniature house II. Look at my little invention. Everyone has lofty ideals, and if you want to realize them, you must start from a small age and start from small things. In order to realize my dream, I began to use my brain and make small inventions first ... Today, when I was watching TV, I saw some decorative ornaments made by people on TV and thought: Can I compare with them? Sure！ I can do it well! At this time, I began to prepare materials. I searched and searched for a long time, and turned the house upside down, only finding a piece of white yarn and some colored threads. Having prepared the tools, I began to make decorations. First of all, I folded the gauze in half, sewed the other three sides with a needle, found a piece of paper as big as the gauze, and put the paper into the gauze after using colored strokes. Then I drew a beautiful picture on the other side of the gauze with a colored pen. Then I sprayed perfume on it. Finally, I tied the numbered one to the gauze and hung a bell at the bottom. In this way, a sachet is ready. Look! This is my little invention! Does it look nice? Whenever I go to school and leave school, I always look at the wind chime, a small invention I made in the window in the summer vacation of my fourth grade. It was the summer vacation of my fourth grade, and I had finished a lot of homework. Just doing this homework makes me nervous. Once, I accidentally saw a box of expired "Sanjing Brand Blue Bottle Oral Liquid" in the living room. I went over curiously and opened it. It was full. I only drank one bottle. I looked at these delicious oral liquids and wanted to drink them, but they were all expired. It's a pity to throw them away. What should I do? I had a brainwave: "I can dump the expired oral liquid in the bottle and collect the bottles outside to make a beautiful wind chime!" " "Let's get started. I first took the bottle out of the box, stabbed a small hole in the bottle with scissors, and then put the bottle down to let the oral liquid flow out bit by bit. I'll put the bottle on the table after all the oral liquid is poured out. I will find out some cardboard and double-sided tape that I haven't used up in art class before, and find out tools such as wool and scissors. After everything was ready, I began to make it officially. Many bells I have seen in the store flashed through my mind, but I don't know what to do. Looking for a lot of art books, I finally found the "underwater world" chime in the art books of grade three. My mother and I discussed it for a long time and decided to do it. I cut it into a circle with blue cardboard first, and then cut off an acute angle on the circle. Then stick the two sides of the corner just cut off with double-sided tape, and it becomes a funnel shape. Next, we will make pendants. Pendants are all kinds of underwater creatures. I drew a big crab on red cardboard, holding big and powerful feet and bulging eyes. It looks so imposing! I cut it carefully with scissors. Then I cut a big, fat carp and a small turtle with a thick shell ... Then I prepared some wool of different colors and lengths and put one on each creature's back. Secondly, I hung a bottle under each creature. This confuses me. How can I hang the bottle firmly on it? It's not nice to put it directly on the bottle mouth, and the bottle is glass, so you can't make a small hole. What should I do? I looked at the bottle in a daze. Suddenly, my eyes fell on the toothpick on the table. I had a brainwave and came up with a good idea. I divided the toothpick into two sections, picked up one section, tied it in the middle with wool, put the toothpick into the bottle mouth obliquely, and lifted the wool. The bottle hangs steadily. I hang all the bottles in the same way. Finally, all the wool connecting the creature and the bottle passed through the center of the funnel. Twisted into a strand, this beautiful wind chime is made. I showed it to my mother, and my mother liked it very much. She praised my good work and hung it in the living room with me. Every time I go to the living room, I look at my wind chimes. Every time the wind blows, my wind chimes will sing "Ding Dong, Ding Dong" in the wind.

7. My invention composition [My invention composition] My invention makes disinfectant One night, my mother was peeling grapefruit, and my invention composition.

I think it's inconvenient for my father to put grapefruit skins in the car for disinfection, so I thought of a good way: put all the grapefruit skins away and take out a bowl and a pair of chopsticks from the disinfection cabinet. After I put the grapefruit skin into the bowl, I poked it with chopsticks.

After about 30 minutes, almost all the water in the grapefruit skin was poked out. This is the disinfectant I made. I put the disinfectant in a small beverage bottle, and then poke a few small holes in the bottle cap with red-hot wire, and a practical disinfectant bottle is ready.

I put the disinfection bottle in dad's car. After several days of experiments, the smell on the car has been reduced a lot. Dad praised me as a clever little inventor.

I think: only by carefully observing the things around you and exerting your imagination can you have inventions. My invention composition is 250 words (/) for primary school students.