Expository essay about 600 words for daily necessities

Apple Expository Text.

The apple is a familiar fruit, it's chubby, and it has a bountiful red color all over its body. Holding it in your hand it will gently cling to your palm, and when you choose it from thousands of apple trees, it is a kind of happiness for it It can bring people a sweet taste, and this is its greatest happiness, apple, which is a fruit that grows in the north. Idioms"Fruitful"That's what it is.

As you walk through an apple grove, the enticing smell of the apple forest will enter your nostrils and even your whole body with a breeze, and the long-lost feeling of comfort will burst out of your long-buried nerves. What could be easier than that? Let me introduce you to Apple!

Flowering apple trees are deciduous trees that can reach a height of up to 15 meters, and are generally 3 to 5 meters tall under cultivated conditions. The trunk is grayish-brown, the old bark has irregular longitudinal lobes or flaky peeling, and the twigs are smooth. The leaf order is single-leafed alternate, elliptical to ovate, with serrated margins.

Umbel inflorescence, petals white, pink when bracting, stamens 20, columella 5. The fruit is a kernel and varies in color and size depending on the variety.

My piggy bank.

I have a beautiful piggy bank and it was a birthday present from my mom. The top of the piggy bank is green, and the rest of the body is red. It depicts a large lawn with blooming flowers, a little boy and a little girl playing, and a grinning grandfather of the sun.

I "feed" it every day. It has been with me for five springs, autumns, winters and summers, and has been with me almost every day.

One year, it was the "Barbie craze", and there were not only one or two Barbie dolls in the hands of my classmates, but seven or eight, but I only had three or four. I thought: pry the piggy bank open!

I was about to get a hammer and pry the piggy bank open. But I can see that the happy faces on the piggy bank are gone. The flowers that bloomed on the lawn lost the slightest spirit and became listless.

The little boy and the little girl stopped playing, but just sat on the big lawn and worried, and the smile on the face of the sun was gone. It all seems to be begging me not to pry open the piggy bank and take away the "food" that I once "fed" them. In the end, I still didn't pry the piggy bank open.

Once, I read the "Welfare Lottery for the Disabled" in the newspaper, and how painful it is for people with disabilities! I also want to contribute my part to the cause of people with disabilities. However, I can't bear to pry open the piggy bank and take away the "food" that has been "fed" it.

Just when I was worried, the scenery on the piggy bank put on a determined look, as if to say, "Little master, pry me open!" Take my 'food' away.

Eventually, I pried the piggy bank open and took all the "food" from it. This time, although I didn't win the lottery, I was very happy because I dedicated my love and strength to the cause of the disabled.

This time, my piggy bank is not as pretty, but I keep it at the head of my bed every day and love it even more. Because it taught me to be thrifty and thrifty, to use every penny well.

When I opened the stationery box, I saw that it was divided into two layers: on the upper layer were my beloved ballpoint pens, colored pencils, taciturn rulers and lively and lovely fragrant erasers; On the lower level are pens with straightforward personalities and pencils with the courage to sacrifice. Whenever I have to do my homework, I use a pen to write neatly.

Whenever I make a typo, I use an eraser to wipe it clean. Whenever I take art classes, I use colored pens of various colors to draw the magnificent rivers and mountains of the motherland.

The thermos flask is a common daily necessities, with a shell made of bamboo strips, iron sheets, plastics, etc., and a bottle bladder inside. The bottle is made of double-layer glass, the two sides of the interlayer are plated with silver and other metals, the middle is pumped into a vacuum, and the bottle mouth has a stopper, which can maintain the temperature inside the bottle for a long time. The hot water bottle is usually called a hot water bottle; Cold food is usually called an ice bottle.

Thermos flasks: scientific inventions.

Scottish James Dewar.

The concept of thermos flasks is simple: the bottle has an inner wall and an outer wall; There is a vacuum between the two walls, and there is nothing (there is not even air in it). Heat cannot be transferred through a vacuum, so any liquid poured into a bottle retains its original temperature for a considerable period of time.

That's why the thermos is able to keep drinks warm in the winter and cold in the summer. Many people who have traveled many times find it hard to imagine what it would be like to be without a thermos.

But the thermos flask was not invented until 1892, although its inventors did not realize how useful it would be at that time. The inventor was the Scottish scientist James Dewar.

Liquid oxygen is produced at a low temperature of -240 degrees Celsius. To preserve this liquid oxygen, Dewar designed a bottle where heat could not be transferred in or out. Now we use thermos flasks, which are derived from this"Dewar"evolved.

Dewar's thermos flask is designed according to heat transfer: first, it is made of two layers of glass bottles, and the vacuum is extracted in the middle of the bottle to isolate the transfer of air to heat; Second, the walls of the bottle are coated with mercury, which reflects the radiation of heat back into the bottle like a mirror reflecting light. Third, the bottle is corked to prevent heat from slipping out of the bottle, and if it is used to hold boiling water, it becomes a thermos flask.

However, it was Reinhold Berg, a German glassmaker, who recognized the usefulness of thermos flasks in all situations. In 1903, he patented a thermos flask and had plans to put it on the market.

Berg even held a contest to come up with a good name for his thermos. The winning names he picked were:"Thermos"(i.e. thermos), that's the Greek word for heat.

BOGE's products were so successful that he soon shipped the thermos all over the world.

Thermos flasks are often used for scientific purposes, for example, when the liquid needs to be kept at a constant temperature. Vaccinia, serum, and other liquids are also often transported in thermos flasks.

Don't forget to brush your teeth with my good companion --- Shanghai acid-proof toothpaste! "Open the paper shell, it can be regarded as seeing the "true face of Lushan". The lid of the toothpaste is green, made of plastic, and it is engraved with fine stripes, which, at first glance, really resembles a small green lampshade.

The shell of the toothpaste is made of plastic, which is very light and not easy to damage.

Toothpaste doesn't look very flashy on the outside, but it has multiple benefits. It has a special prevention and control effect on tooth erosion and tooth root exposure. It has a very significant effect on the pain of teeth after being cold, hot and sweet.

Unscrew the lid, and a light and elegant spearmint will come to the nose, making people feel refreshed; Unscrew the lid, and although you can't see its colorful colors, you can see its white front color. I like the noble quality of it: it doesn't pay attention to whether it is gorgeous on the outside, but about how effective it is, so that people can use it comfortably.

There are many businessmen who are like this, and they don't need others to test them for a lot of money... Instead, they quietly donate money to children in poor mountainous areas, so that those children can study and go to the campus to learn like us. These adults are like the fathers and mothers of the motherland.

Chopsticks are a major invention of the Chinese. It is said that there are three ways to eat in the world: 40% of people use their hands, 30% use chopsticks, and 30% use knives and forks.

China began to use chopsticks as early as the Yin Shang era, but it was not originally called "chopsticks". In pre-Qin literature, chopsticks are referred to as "chopsticks" or. During the Sui Dynasty, chopsticks were also known as "tendons".

How did the term "chopsticks" come about? According to Lu Rong of the Ming Dynasty in the Shuyuan Miscellaneous Records, Wuzhong in Jiangnan called the "chopstick" "Kuai'er" and the "banner cloth" as the "rag". It is because the people who sail the boat are taboo to "live" and "turn".

After the Song Dynasty, a "bamboo" head was added to the word "fast" to become "chopsticks", which is probably due to the fact that most of the chopsticks are made of bamboo.

The structure of chopsticks is extremely simple, and the chopsticks in China are thick at the top and thin at the bottom, and round at the bottom. When chopsticks were introduced to Japan, they were made into conical shapes.

Although the chopsticks are simple, the Chinese have also done a lot of work on the material and carving on the chopsticks. In the pre-Qin period, there were ivory chopsticks and copper chopsticks. Since the Sui and Tang dynasties, the court, the government and the homes of the wealthy have used gold and silver to make chopsticks, and jade, coral and other carved chopsticks.

The elaborate chopsticks are also inlaid with a silver head, which is used to test whether the food is poisonous, if it is poisonous, the silver head will immediately turn black or green.

Chinese's kung fu with chopsticks often attracts foreigners, and in recent years, the West has risen "chopstick fever", and there are also "training centers" that specialize in teaching people to use chopsticks. Some medical scientists believe that the use of chopsticks can drive more than 30 joints and more than 50 muscles of the human body, which contributes to the dexterity of the hands and the development of the brain. It is also said that the Chinese are particularly skillful in their hands, which has a lot to do with the use of chopsticks since childhood.

It is said that the world's first "Chopsticks Museum" is in Germany, where more than 10,000 kinds of chopsticks of different origins, textures, and times are exhibited. It's a big deal.

You can just find a daily necessities and introduce what it looks like and what it does.

Once upon a time, I was a little tree.

One day, I turned into a pretty little bench.