How to write an introduction to something with 3 ways to explain?

Expository essay essay: computer.

With the development of technology, computers have entered the lives of many people. Last year, I also got a computer, which brought me a lot of convenience, increased my knowledge and broadened my horizons. Computers are divided into three main parts, the monitor, the main unit, and the keyboard.

A monitor is a large screen that, like a television, displays a variety of icons. The host computer is the "heart" of the computer, with two eyes, one large and one small, one to start the program and the other to restart the program. The biggest credit is the keyboard, which contains 26 English letters, 4 arrow keys, 10 numbers, and some indispensable function keys.

Each of them stays at his own post and serves his master. The computer also has a small tail, which is the mouse, the mouse is used to issue instructions, and the monitor will obey its instructions, which is the magical function of the computer.

Computers are also known as electronic computers.

It was invented by scientists after years of research. After several generations of "multiplication", electronic computers have become "versatile" computers. Computers can access the Internet, and the information on the Internet is even more colorful.

Don't look at the computer's hard body, if you encounter its nemesis - electronic virus, the consequences will be unimaginable. But if you can open the antivirus software, the virus will be destroyed, just like giving medicine to a patient.

Banana. In the morning, my family came to Lotus Village for a walk, and the banana forest on the side of the road attracted me.

Plantain tree. Very tall, the leaves are large; Long and round, about meters long and about 30 centimeters wide. The leaf surface is emerald green, with thick main veins and parallel veins on both sides. Like a big fan, I can't help but think of [Journey to the West.

Middle, Princess Iron Fan.

If I can pick a leaf and carry it home, and fan a few fans for my mother, how cool it is, my mother will definitely praise me for being a good child.

I suddenly noticed a long stick in the leaf bush at the top of a baggio tree, and at the top of the stick there was a huge flower bud, like the bones of a lotus flower, but its color was light green.

I heard my father say: Plantains can eat the nutrition of bananas, and they look similar, but plantains are not crescent-shaped, and they are much smaller. However, from the perspective of traditional Chinese medicine, it has the effect of moistening the intestines and laxative, but bananas are cool, plantain is neutral, people who are afraid of cold should not eat more, and the elderly should eat plantain.

Father, the buds of the plantain are so big, and the moment of opening must be beautiful, right? Father smiled and told me to take a closer look. I looked at this big bud from a different angle, and sure enough, I made a new discovery:

A petal of the bud, revealing two long rows of flowers, each row has a dozen, the petals are white, there are two large and small two, as soft as silk: the pistil is white, but the heads of the five stamens are yellow and curly, and if you look closely, there is a petal that is transparent, and there are small ants collecting pollen in it, I think the nectar must be sweet.

Looking at the tall banana tree, I can't help but think of Yang Wanli's "Song of Basho" in the Southern Song Dynasty

The bones are exquisite, through the eight windows, and the flower head is inverted with purple lotus incense. Surrounded by countless Qingluo fans, the wind does not come and it is also cool.

At the urging of his father and mother, he reluctantly left the banana forest and went home.

Choose one of the two.

If it is not suitable, you can ask it.

Hello, thank you so much for your efforts.

1.On my writing desk, there is a small delicate lamp.

2.The table lamp is more than a foot high, and it looks really exquisite and elegant, beautiful and generous.

3.This was bought by my dad when he was on a business trip.

4.Its lampholder was green, and near the bulge of the lampholder, a round hole was cut through which the wires were threaded.

5.The lamp head, the thickness of the lamp pole is moderate, the color is harmonious and elegant, and the shape is graceful and generous.

6.There are two fish carved on the pole, and one of the fish on it has its eyes looking into the distance, as if it is looking at something and thinking about something.

7.Below, a fish, looking at its companion, seems to ask, "What do you see, can you tell me?"

8.The edge of the lampshade looks like lace tied with silk, and there are four beautiful pictures on the cover, one of which is a green bamboo.

9.The bamboo joints are thick and strong, and the leaves are green and branched, which makes people feel full of vitality and spring at a glance.

10.The other three are paintings of flowers and birds, which are beautiful and bright, adding a lot of color to the table lamp.

11.This small lamp squats quietly on the writing desk to illuminate us.

The teaching building of our school is very magnificent, and the whole looks like a giant standing there (for example), and after getting to know it, I learned that it is 20 meters high, covering an area of about 10 acres (column number), which is 5 meters higher than the laboratory building (for comparison). An analogy is a way of illustrating the characteristics of something through the rhetorical method of metaphor. The similarities between two different things are used to compare them, so as to highlight the shape characteristics of things and enhance the vividness and vividness of the explanation.

It's called analogy.

The methods of explanation include: listing figures, giving examples, citing information, categorizing, analogy, etc.

1. Column numbers

The column numbers are explanatory text.

A common method of explanation, a method of quantitatively explaining the characteristics of things or the reasoning of things, makes the statement more accurate, more scientific, more specific, and more convincing. Figures need to be accurate and estimates must be based on reliable evidence.

Note: The enumerated time and era are not column numbers.

2. Give examples

An example is an explanatory method that illustrates the characteristics of a thing by giving representative and appropriate examples, in order to illustrate the situation or reason of the thing. Logically speaking, people don't understand it very well, so it is necessary to give some examples that are both easy to understand and representative to illustrate, so that the things that are intended to be described are clearer.

3. Citations

Citations are an explanatory method that illustrates the characteristics of things by quoting some inherent materials in the explanatory text. Citing information can also increase the reader's impression of the article. In addition, in order to make the content of the explanation more substantial, more specific and more vivid, you can cite information to explain.

The range of citations is very wide, and it can be classics, famous sayings, formulas, laws, allusions, proverbs, etc.

4. Categorization

To explain the characteristics of things, it is often difficult to explain them from one side, and things can be divided into several categories according to the similarities and differences in their shape, nature, cause, function, and other attributes, and then explain them one by one according to the categories. This kind of illustrative technique is called categorization. Categorization is an important way to explain complex things, and sometimes the characteristics and essence of things need to be divided into several points or aspects to explain, which also belongs to subcategories.

5. Make an analogy

An analogy is a way of illustrating the characteristics of something through the rhetorical method of metaphor. The method of using the similarities between two different things to compare them to highlight the shape characteristics of the things and enhance the vividness and vividness of the explanation is called analogy.

Writing ideas: You can use explanatory methods.

Introduce "animals" or "plants", for example, introduce "pomegranates" by introducing plants, and introduce the appearance, color, taste and other characteristics of pomegranates.

Body: Pomegranate is a very common fruit that generally ripens in autumn. Pick a crisp autumn day to go to the orchard, pomegranate tree.

It is covered with "small lanterns", giving people a sense of joy. When I took a closer look, I found that the pomegranate looked very much like an onion, with a reddish yellowish color and a yellowish yellow color, with some black-brown spots on it. It's not very smooth to the touch, and it's even a little rough, and the whole thing looks like a face full of freckles.

A little girl in the countryside. At this time, some people may think: the appearance of the pomegranate is so ugly, then its flesh must also be ugly and difficult to eat! Haha, then you'd be very wrong.

Pomegranate is the standard "beauty of the mind". Gently cut the pomegranate skin with a knife, and a red light shines into your eyes, stabbing you so that you can't open your eyes. When you open your eyes, wow!

Red dolls have jumped into the plate and are greeting you! The flesh of the pomegranate resembles a crystal clear ruby.

and priceless red agate.

It's mouth-watering when you look at it, and you can't wait to taste it.

I took one and put it in my mouth, and when I bit it gently, I heard a "click" sound, and the sweet and delicious juice instantly came out, filling the entire mouth. It was a wonderful feeling! Like a bee butterfly flying into the flowers; Like a breeze blowing through a field; Like a clear spring flowing into my internal organs.

If it's too much trouble to eat one by one, then please enjoy it spoonful by spoonful!

Pomegranates are highly nutritious and contain vitamin C and B vitamins.

Organic acids, sugars, proteins, fats and minerals such as calcium, phosphorus, and potassium have the ability to clear heat and detoxify.

Blood-replenishing, blood-invigorating and other effects. The skin, roots, and flowers of pomegranate can be used in medicine, and experiments have shown that pomegranate peel also has obvious antibacterial and astringent functions! Pomegranates are really treasures all over their bodies!

Although the pomegranate does not have a gorgeous appearance, it has a crystal heart, and I think the same should be true of human beings. Just like a gift, the inside is more precious than the outside, and the content is more precious than the packaging. I love this ordinary pomegranate!

Do you have shampoo in your house? Just write it!

Many people have seen my pencil case and said that it is sturdy and beautiful. Actually, in my mind, a pencil case is much better than a pencil case. My pencil case is very beautiful :

The silver undertone is sparkling, and with the addition of pink, cute strawberries and a few colorful little flowers, it's really cute. My pencil case "height" is about 21 cm.