The worst invention of the transition paragraph is to say that the first few paragraphs can have an

In a celebrity interview, when asked what the most important invention of the last century was, some said it was the computer, some said the automobile, and so on. But a well-known person in Singapore said it was an air conditioner. He explained that without air conditioning, tropical regions such as Southeast Asian countries would not be highly productive and would not be able to reach today's standard of living.

He is realistic, reasonable, and well-founded.

After reading the above report, I suddenly wondered: why no reporter asked, "What was the worst invention of the twentieth century?"

In fact, in mid-October 222, a British newspaper rated it as "the worst invention of mankind." The "award" is the plastic bags that people use in large quantities every day.

Born in the thirties of the last century, the family of plastic bags includes fast food lunch boxes, wrappers, meal cups and plates, beverage bottles, yogurt cups, ice cream cups and so on. The garbage formed by these wastes is large, large, light in weight and non-degradable, which brings many technical and social problems to the treatment work.

For example, plastic lunch boxes scattered in fields, roadsides and grass can be harmful to health and even death if swallowed by livestock. The land that fills the waste plastic bags and plastic lunch boxes cannot grow crops and trees, causing the land to compaction, and the incineration of these plastic waste will release a variety of chemical toxic gases, one of which is a compound called dioxin, which is extremely toxic.

In addition, the freon used in the production of plastic bags and plastic lunch boxes has caused serious damage to the human immune system and the ecological environment.

1.The article briefly writes about the many plastic bags, and details the harm of plastic bags to the ecology. The third natural paragraph is the transition paragraph.

Abbreviations: plastic bags, many.

Details: Paragraph 3 of the ecological harm of plastic packaging bags.

Students often buy some biscuits to put at home and eat them as snacks, but the general box lid is not good, and when you touch it lightly and fall to the ground, the lid will immediately break, and all the biscuits inside will leak out, which is very difficult to clean up. Also, if the biscuits are left for a long time, the biscuits will be easy to spoil, and I can't eat them, so I have to throw them away, so I hurt my brain, and finally thought of a perfect solution.

I don't know anything about cookies, but I still know a thing or two about boxes. The lid of the biscuit box is not tight because there is air in it, and the biscuit is easy to spoil, also because it comes into contact with air, as long as there is no air in the biscuit box. But how can I empty the air, when I opened the drawer to look for information, I opened the drawer and suddenly there was a gust of wind, by the way, make a small hole under the lid, and make a drawer-like thing on the side, as long as you keep pulling the drawer, the air will be pumped out along the small space, and the air in the box will be emptied, so that the lid will not fall off so easily, no matter how many cookies you buy are only put in such a box, you are not afraid of breaking.

And you don't have to remember how many times you have to use it to evacuate the air, you just have to keep pulling and pulling, and when you can't pull it, the air in it will be gone, and you don't have to worry about not being able to pull it out, just pull it gently.

How's it like, my tech everyday life gadgets are both practical and simple!

You can explore and invent on your own.

I'm innovative, I'm happy.

Science is closely related to our lives, and as long as we pay attention, we can have some small inventions and small creations. These make our learning life rich and colorful, and are the testimony of our childhood.

There is a field near my house where there are many vegetables and crops. Whenever people sprinkle water down the pipes into the fields, one by one, I wonder: why can't there be something convenient that saves water and easily transports the water needed for vegetable crops?

So, I started a series of associations.

I wanted to make a pipe out of a plastic mineral water bottle and dig a few small holes under the pipe to let the water soak every inch of the soil without wasting it. And after actually making the pipes, I realized that the pipes are still a certain distance from the roots of the plants, which will waste a lot of water.

What to do? In our geography books, we learn that Israel, a water-scarce country, sends water directly to the roots of the plants in order to save water, which consumes a small amount of water and meets the needs of the plants. Based on this inspiration, I pricked a small hole in the bottom of the finished drink bottle with a needle, filled it with water (it must be filled with a bucket, otherwise it would be a waste of water), tightened the cap (there must be air entering according to the water flowing down, so it does not leak), and then dug up the soil and placed the bottle in the middle of the soil, the bottom of the bottle is about the vicinity of the roots of the plant.

Make one per square meter, unscrew the cap slightly and let the water run down slowly. In doing so, it not only saves water resources, but also provides convenience for farmers. I named this method "water bottle irrigation".

This alone was not enough to meet the needs of the tree, so I had the idea and invented the "natural pouring method". This method was developed by improving the water bottle irrigation method. It works by using weather factors such as rain and a small amount of human factors to irrigate the trees.

It is made by cutting two beverage bottles that are about the same size as the mouth of the bowl respectively, and erecting two water catchers with the part with the cap on both sides of the plant; Then put a few large holes on one side of the remaining two parts and insert them into the soil, the side of the hole is aimed at the plant, and the lid of the water receiver is tied with a few holes, and then put it into the bottle. In this way, the natural pouring method is complete. But a few points to note are:

First, this method should first fill the bottle with water and take measures according to the weather; Second, dig the hole appropriately, don't dig too big or too small; Third, the bottle should be appropriate for the size of the plant.

Here are some of my little ideas that have enriched my life. In the process of my invention and practice, I know the value of innovation. We must always maintain a heart that is good at discovery and dare to create, so as to add a color to our study and life.

I have a lot of inventions, but they are all in the making, but I believe that one day my inventions will become a reality!

Let's reveal one first, or you're going to call me stingy, haha. Magic trash can - its specific structure is like this, there are two buckets, the body is round, but it is equipped with an automatic cleaning system inside, a turbine inside, it will automatically put the garbage into another can, in addition, it can also be installed voice system.

On summer nights, pesky mosquitoes always bite people, suck people's blood, spread diseases, and buzz non-stop, making people sleep poorly. I wanted to invent a special anti-mosquito perfume.

This perfume, made with a special material, can give off a particularly exotic scent. As long as mosquitoes smell this fragrance, they will immediately lose their ability to attack and fertle, and they will not be able to suck human blood, let alone reproduce offspring, and they will also infect each other, and over time, mosquitoes will slowly die out.

This mosquito killer is not only effective against mosquitoes, but also against flies, cockroaches, bed bugs and other pests. However, it is harmless to humans and their friends, poultry, livestock, and beneficial insects. Why is that?

Because in the process of perfume making, we have extracted the genes of these four pests and mastered the "life" of the "four pests", so the perfume produced is particularly targeted, and it will definitely become a "super secret" to eliminate the "four pests" in the future!

I've said so much, you may ask, how to make this perfume? Hehe, can I tell you that my perfume is in the trial stage! When I get a patent and then I put it into production, then you can buy it everywhere.

Everyone has great ideals, and if you want to realize your ideals, you must start small, starting from small things.

In order to realize my ideals, I started first, and I used my brains to make small inventions......

Today, when I was watching TV, I saw the decorative hanging items made by some people on TV, and I thought: can I do it better than them? Yes! I'm sure I'll be able to do it well!

That's when I started preparing the materials. I searched and searched, searched for a long time, turned the house upside down, and found a piece of white gauze and some colored threads. Once the tools were ready, I started making 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 gauze, drew on the paper with a colored pen, put the paper in the gauze, and sewed the gauze. Then, I painted a beautiful picture with a colored pen on the other side of the gauze, and after that, I sprayed perfume on it. Finally, I tied the numbered ones to the gauze and hung a bell underneath them, and just like that, a fragrant purse was made.

And lo and behold! This is my little invention! Is it good-looking?

My little invention.

I have a little dream of inventing a new type of watch.

There's something special in the new watch that I invented, it can be transformed into a house, it can take us to an amusement park, and it can be transformed into a computer ......After looking at these special things, do you really want to own it? It can also zoom in and out of things.

The watch I invented had three keys in it, which were red, yellow, and blue. If you press the red button, the watch will become larger; If you press the yellow button, the watch will buy you what you need. If you press the blue button, the watch will sweep the floor for you. Amazing!

I took my newly invented watch with me and went to the amusement park. Its three major characteristics are large, far, and tall. You have to remember not to press the red, yellow, and blue keys randomly.

The watch I invented came in handy! It can take me somewhere else to play at any time, it can make the house bigger, and it can help me clean up, isn't it very useful? It can also bring a beautiful world.

I have invented a new type of watch since I was a child, and playing with this watch since I was a child will give you knowledge, and it can also bring you what you will invent in the future, which means that it can solve mysteries that we can't solve. I have fewer mysteries to solve, and I still have many mysteries that I can't solve.

The watch I invented can also help me solve the mystery that I can't solve. I'd love to further improve the new watch and let it help me solve all the mysteries that I can't solve.

You made your own invention of Shenma, so you wrote Shenma...

My little invention.

It was the summer vacation of the fourth grade, and I had already done a lot of my homework, but the small project was a headache for me. Once, I accidentally saw a box of expired "Sanjing brand blue bottle oral liquid" in the living room, I walked over curiously, opened it and saw that it was full, and I only drank one bottle! I looked at these delicious oral liquids and wanted to drink them, but they had expired.

What should I do if I throw it away and feel sorry for it? I had an idea: "I can pour out the expired liquid in the bottle and collect the outside bottle to make a beautiful wind chime!"

I first took the bottle out of the box, stabbed a small hole in the mouth of the bottle with scissors, then put the bottle side down, let the oral liquid pour out little by little, and put the bottle on the table when all the oral liquid was poured. From home, I found some cardboard and double-sided tape that had not been used up in art class before, and found wool, scissors and other tools. Once everything is ready, the production will begin.

My mind flashed to the looks of many wind chimes that I had seen in the store, but I didn't know what to do. I searched for a lot of art books, and finally found the "Underwater World" wind chimes in the third grade art book. I discussed it with my mom for a long time and decided to do it.

I used a piece of blue cardboard and cut it into a circle, then I cut out an acute corner on the circle, and then I glued the two sides of the corner that I just cut off with double-sided tape to make it a funnel shape. Next, it's time to make the pendant. Pendants are a variety of sea creatures.

I drew a big crab on a piece of red cardboard, holding up big and powerful feet, puffing out a pair of big eyes, looking so majestic! I carefully cut it out with scissors. Then cut a fat big carp and a small turtle with a thick shell on its back ......Then prepare some yarns of various colors of different lengths, and glue one to the back of each creature.

The second thing is to hang a bottle under each creature, and then I can't be confused, how can I hang the bottle securely on it? Put it directly on the mouth of the bottle, it doesn't look good, and the bottle is glass, and you can't make a small hole underneath, what should I do? I stared at the bottle in a daze.

Suddenly, my eyes fell on the toothpick on the table, and I had an idea to think of a good idea, I divided the toothpick into two sections, picked up one section, tied it from the middle with a yarn, and then put the toothpick diagonally into the mouth of the bottle to lift the yarn. The bottle hung securely. I hung all the bottles in the same way.

Finally, all the yarns connecting the creature and the bottle are threaded through the center of the funnel and twisted into a strand. Such a beautiful wind chime is ready. I showed it to my mother, who liked it very much, praised me for doing a good job, 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" and dance in the wind.