写秋天的英语作文怎么写(优秀20篇)

I love autumn, why? In my eyes, autumn is a colorful season, is the harvest season.

I love the fall of the ripe. There was a golden scene in the field, and the heavy rice laughed and bent over, as if to the people, "I can not hold it anymore! I can not hold it!" The white cotton bloomed on the cotton swabs. Blowing, dancing with it, gently touch it, soft, very comfortable!

I love the colorful colors of autumn. The sky is blue and blue, peoples autumn is colorful, the road on the vehicle is colorful, everything surprising; roadside trees grow taller, the leaves of the green gradually faded, began to yellow, autumn Blowing, falling leaves, falling leaves it!

I love the fragrance of autumn. District, the parks fragrance of sweet-scented osmanthus blowing, I could not help but approached the sweet-scented osmanthus tree, the smell is getting thicker, really refreshing! Chrysanthemum is not absent, it is also the protagonist of the fall. They scrambling to show their own: white, yellow, purple ... ... layers of layers, gradually start, people relaxed and happy!

I love the Smart of the fall. The geese are flying at high altitudes, and are they going to the south for the winter? They are sometimes in a zigzag, sometimes in a zombie, like a soldier in a squad! The park is full of children. In the skating, some in the bike ride, and some in the chase play. Look, the sky is still flying all kinds of kites it ... ...

What a charming autumn!

As for me, I have a special emotion to autumn. Autumn always gives me a kind of feeling which can make me forget sorrow. Every time when autumn comes, I am always glad to feel the beautiful season. I can enjoy myself in this great season.

对我来说，我对秋天有一种特殊的情感。秋天总是会给我一种让我忘却悲伤的感觉。每一次，当秋天来临的时候，我总是很高兴去感受这个美丽的季节。我在这个美好的季节里可以尽情享受自我。

I like the wind of autumn. It is cool and comfortable. When the wind kisses my face, I will close my eyes and smile. I know that wind brings me the breath of autumn. She lets me understand that autumn is full of happiness. I can smell and taste autumn everywhere. The view of the autumn will give me a huge enjoyment. As for me, the wind in autumn is the best present. I am deeply attracted by the autumn wind. This taste of autumn is delicious.

我喜欢秋天的风。秋风是很凉爽的，很舒服的。当秋风亲吻我的面颊的时候，我会闭上我的眼睛并且微笑。我知道秋风给我带来了秋天的气息。她让我明白秋天充满了快乐与幸福。我可以在每一个角落嗅到并且尝到秋天。秋景给了我巨大的享受。对于我来说，秋风是最好的礼物。我深深地被秋风吸引着。这个秋天的味道是美味的。

I also love autumn colors. The leaves will turn yellow in autumn. This kind of yellow represents hope and maturity. When I see these yellow leaves, I will think that they still enter into the soil and will give the tree adequate nutrition. Thus, they never leave the tree. I am moved by this sentiment. This phenomenon gives me many thoughts about human society. I believe that our society will have a better development if we realize that we should have a grateful heart. Autumn colors are so magical for me. They let me have bigger imagination space to think over life. I know this taste of autumn is sweet.

我也爱秋天的颜色。在秋天，叶子会变黄。这种黄色代表着希望与成熟。当我看见黄叶时，我就会想他们还是会回到泥土里的，给予树充足的营养。这样，他们就从未离开过树了。我被这种情感所打动。这个现象给我很多关于人类社会的想法。我相信如果我们能够意识到每个人都应该有一颗感恩之心，那么我们的社会就会更加发展。秋天的颜色对我来说真的很神奇。他们让我有更大的想象空间来思考生命。我知道这个秋天的味道是甜的。

I really appreciate autumn quality. In my eyes, autumn is just a mature person. And her love requires no return. In this season, when I walk on the way, I can feel her sincerity and her firmness. Although she can’t speak one word, I can learn something from her. This taste of autumn is pregnant and attractive.

我真的很赞赏秋天的品质。在我眼里，秋天就是一个成熟稳重的的人。她的爱不求回报。在这个季节，当我走在路上时，我可以感受到她的真诚与坚定。尽管她不能说话，但是我可以从她身上学到很多。这个秋天的味道是意味深长的，吸引人的。

Autumn is my favorite season and I will go on to feel autumn. Autumn also makes me have a deeper understanding of cherishing everything that I have now.

秋天是我最喜爱的季节。我会继续感受秋天。秋天也让我对于珍惜现在所拥有的有一个更加深刻的理解。

Autumn field is very beautiful.

The field of autumn is golden. You see, that golden rice spike golden yellow, the breeze blowing, like a group of children dancing in the fields between the beautiful dance, has been slowly falling yellow leaves, like a butterfly in congratulations on the harvest Of the season.

Autumn field is harvest, hardworking. Look, the farmer uncle is harvesting has matured laughing rice, the amount of sweat is flowing down the cheeks, dripping in their hands on the rice ears, drops in front of them on the land, this is Is not "hoe Wo day when the afternoon, sweat drops under the soil, who knows the plate of Chinese food, grain are hard," the true portrayal of their side of the harvest while feeling the joy of harvest. Evening autumn with the slightest chill, the birds have been back to the nest, but they did not feel a little tired, but the spirit of doubling.

The field of autumn is full of poetic, only a beautiful picture. Looking at the field of autumn, I seem to think that this is a picture of rice in this painting. I am proud and proud to bring you laughter.

This is the field of autumn, full of harvest, joy and hard-working autumn field!

I like the vibrant spring, like the hot summer weather, but also like the vast expanse of winter, but my favorite golden autumn.

In the autumn, the rice in the paddy fields was ripe, and at first glance, it seemed like a piece of gold, and the peasants were one by one to pick up their own gold in their own fields. Breeze blowing, the golden ocean set off a layer of wheat waves.

Fruit trees are covered with their "achievements": persimmon tree, distant like hanging a red lanterns. Persimmon who you squeeze me to push, it seems: "pick me, pick me, my meat can be sweet." Jujube trees, jujube are out of a place, people quickly picked up, I picked up a bite, Good acid ah! Vineyard in the grapes have purple black, with black pearls, eat the mouth sweet and sour, people can not forget that taste.

Autumn of the stream or so cool, take off his shoes, sitting on a large stone for a while, the whole people are spiritual shaking.

I love the fall, more love autumn scenery.

The wind of autumn is a key. It is cool and gentle, slowly, slowly, while you did not pay attention to the door of the border to open the border. As soon as you enter the autumn world, you will soon see the harvest orchard. Pear fragrant, pineapple sour, apple sweet. Uncle aunt is busy putting these delicious fruits in the basket.

You see, orange, persimmon seems to wait, you squeeze me touch, scrambling to people to pick it. The west side of the orchard is a large garden of Guan Li. The garden is open all year round. What is the twill of this season? Oh, it was beautiful chrysanthemum. Chrysanthemums are purple, yellow, golden, white, pink ... ... really colorful, very beautiful off!

Guan Lis chrysanthemum nodded slightly in the autumn wind, like a little girl of Guan Li. There is a wide field in the southeast of the garden, and the fields grow millet and corn. Golden grain is wrapped in the valley, like a baby in the burden, had to be quietly crowded together. Corn cob in the corn grain like a golden little teeth, it is truly cute. Corn and millet are bowed, modestly invited the master to harvest.

Field east is a woods. The woods planted with white birch, trees, pine and cypress, ginkgo tree, dragon claw Huai, Ching Chung, Guan Lai extremely. Every fall, the leaves fall from the tree down, leaves like a yellow butterfly in the forest dagger dance, pine and pine and cypress is more green.

Autumn is really beautiful, I love autumn!

The poets fall is always so charming, in my eyes the most charming or autumn color.

Autumn is the harvest season, the road next to the rice is ripe, heavy ears pan pressure rice rod can not lift the head, waves of autumn wind blowing, set off waves of rice waves ... ... Oh, the original autumn is golden! Suddenly immersed in the joy of discovery.

Afraid of a string of cold in the race open, a small and exotic safflower, like a small bell, as if a touch, it will jingle. To the distance to see, the autumn wind blowing, a bunch of red like a glimpse of the edge of the sea; near to see it, blossoming bunch of red on the green branch, as if many red girls standing on the wire dancing. Looked at the front, there will be "61" Festival students wearing red shoes on the stage dance scene ... ... Oh, autumn is red.

Autumn is the most beautiful or a piece of wild chrysanthemum, red, white, black, purple, all kinds of colors are. Those who look ugly chrysanthemum, but there is a tenacious perseverance, the kind of unyielding spirit worthy of our study. Where a cluster of flowers almost reconciled to the flowers also maintained a little gesture, it seems refused to fall. So I thought of a song: "the sun fell tomorrow will be the same rise, the flowers thank the next year will be in full bloom." I thought of "do not fight the Chinese do not take the red, since the snow clear snow" The Those chrysanthemums graceful, customs million, like to use their own do not have the grace in the fall of this season dominate. Farmers uncle of the rice harvest, and they busy outside, never tired, that harvest fruit, it is the symbol of autumn.

Stop sitting Fenglin late, frost leaves in February flowers! How full of poetic fall.

It’s the middle of September now and the autumn has come. The hot days have gone. It’s cool in the morning and at night. It’s more comfortable than ever. But the weather is a little bit dry, so we must drink more water. In the northern part of China, the leaves turn yellow and look beautiful, but in the south, there is little change. I love autumn very much because I like the scenery in the autumn.

现在是九月，秋天已经到来了。天热了。早上和晚上很凉爽。比以往任何时候都更舒适。但是天气有点干燥，所以我们必须多喝水。在中国的北部，树叶变黄了，看起来很漂亮，但在南方，却没有什么变化。我非常喜欢秋天，因为我喜欢秋天的景色。

I like the spring of vitality,it makes me kind of dedication to life; the busy summer I like bright,beautiful and full,because it is not always the envy of others; I like winter Shen Su,permanent collections,as It contains the life and vitality.However,I prefer the autumn of my eyes,he it is so bleak,so the United States.So colorful.

Fall is harvest season so that we do not have to worry cold winter need food,the trees apples,pears children,Sinopodophyllum are you will not let me I will not let you argue the knot over the fruit,really want to go here end of a fruit,delicious taste that can not bear,lest they disturb pyronaridine beautiful dream

Well,red maple leaf as fire,falling from a tree just like a butterfly dancing in tribute to the beautiful autumn.Story is also in full bloom,though they do not have beautiful flowers in spring,autumn,given the addition of a few angry.People spend the hot summer,and praised the fall,as they fall to cool.

I am the eyes of autumn,was not letting a hundred flowers bloom in spring are the decorative chrysanthemum; I was not the eyes of the autumn leaves of the lush summer,but the falling leaves; the fall of the eyes,although I did not understand the snow day,but blowing it heart of the cool breeze

The fall,my eyes will always be so distinctive,so fascinating!

我喜欢春天的勃勃生机,它令我对生命有种执着;我喜欢夏天的繁华似锦,美丽充实,因为它总是让人羡慕不己;我喜欢冬天的沉肃蕴籍,收藏永恒,因为它蕴藏着生命和生机.但,我更喜欢我眼中的秋天,他它是那么的萧瑟,那么的美.那么的色彩斑斓.

秋天是个丰收的季节,让我们不必担心严寒冬天所需要的食物,看,树上的苹果,梨儿,桃儿,都你不让我我不让你的结满咯果子,走到这里真想结一个果子,尝尝那美味,可又不忍心,生怕打扰咯它们那美丽的梦境

看,那枫叶红的像火,从树上掉下来像一只只翩翩起舞的蝴蝶,在赞颂秋天的美好.秋菊也绽放了,虽然它们没有春天的百花艳丽,却给秋天增添了几分生气.度过炎热夏天的人们,称赞秋天,因为秋天带给他们凉爽.

我眼中的秋天,虽没有春天的百花齐放却有菊花的点缀;我眼中的秋天虽没有夏天树叶的茂密,却又枫叶的飘落;我眼中的秋天虽没有懂日的雪景,却又吹拂人们心田的凉风

秋天,我的眼中永远是那么的有特色,那么的吸引人!

Summer brother gone, autumn aunt came again, she took the summer brothers class. Since the autumn aunt came later, the weather cooler, no longer welcome as warm as summer brother, autumn aunt finally let the weather slow a slow, or else, not let the weather happy dead, then we may suffer The.

I heard the autumn aunt came, the tree father was very happy, big tree father happy, can be infected with the above small leaves, they heard, that is, popular drink spicy, these small leaves are drunk, small face are Become glowing. Some fruit trees, also heard the arrival of the autumn aunt, happy to produce a lot of fruit, the fruit trees themselves almost collapse.

From summer to autumn, many people from the short sleeve into a long sleeve, from shorts and skirts into a trousers.

Autumn aunt came, the world a lot of things have changed, the weather has changed, the plant has changed, peoples clothes have changed ... ... a lot of things have changed.

I really like the fall!

High-rise buildings for dusk, Indus leaves on Xiaoyu rain. --Inscription

The raindrops were spinning in the sky and seemed to cheer for the location of the summer rain. Its dancing infected with the hot summer heat uncle and that annoying cicadas, they all want to see the interpretation of the autumn, but still was driven away by the wind.

Autumn sparse under the rain, wrapped in a layer of sadness. It is sad in what? Originally, it is blaming themselves, blame their coming to give a lot of good life is about to end the hint. Yeah, those "withered old trees faint crow, bridges people, trail westerly thin horse." The bleak picture, though by your hint after the picture. However, you do not know, without your kindness hinted that everything will know how the last interpretation, how will the interpretation of the most beautiful dance it So, you use the enthusiasm of the red maple leaves, so that it is in the last interpretation of the moment, with the most unique color of the fall. Then, you put your magic sinking rain dripping to the field, so that rice in the end of the life of the moment, the last bath once, and then in their own sleep, was stripped of the shell, leaving a small toot Particles, in the dream of peace with the world farewell. Let them go so quietly, without any pain.

Autumn is a magical painter, with its unique brush out of a "day street rain, such as crisp" ink painting. In the scroll, the little girl who holds the oil paper umbrella, with the autumn rain in the same umbrella, she is listening to the rain in the paper on the paper umbrella melody, try to interpret the autumn rain under every dream. Lying on the side of the leaves, in the autumn rain Xiaoxiao sprinkled, the veins flowing in the autumn rain, the wind cruel attack it, because the fall of love and this piece of poor little leaf tied to the ground, no longer let it suffer the wind All the way to torture. Leaves drank the raindrops of rain, obediently stay on the ground, that sitting shaky, and with a slight wind, even more autumn. Ink painting in the autumn rain, with their own vitality of the brush, everywhere depicts his own unique beauty. Autumn in the ink painting stroked in the past, when we had time to fall for the leaves and sigh, but our eyes attracted in such a beautiful picture. I worship this magical autumn painter.

A refreshing autumn debut of the fall ...

Among all the four seasons,I like autumn best.

Compared with summer,its very cool in autumn.People can go travel or just have a walk in the day.Leaves begins to turn yellow,if you walk on a road with trees on its both sides,you will see all kinds of yellow leaves on the road,and some leaves are falling and dancing with wind.What a beautiful view.

Autumn is a harvest season.Wheats ,vegetables and fruits all get ripe.Farmers are busy with harvesting.And we children also help our parents at time. Though its very tired,we are very happy.

Annual the autumn, we can come to here, the ginkgo that admires the autumn forest.

Stands in Lin Bian, scan widely looks, grove hope to be less than a head. Ginkgo tree is lofty and forceful, the sky continuously. The branches and leaves on crown of a tree is very dense, mutual crisscross is worn, formed a natural Lin Yin corridor. Sunshine asperses aureate ray to the earth through flourish branches and leaves, the shadow of branches and leaves is mirrorred go up, formed the facula of alternate with of a lot of light and shade. Aureate sunshine is illuminated on small grass, also set to small grass went up a shining Phnom Penh.

An autumn wind has blown leaf swirls from branch the ground waves fall down, some resembles a young fan yellow, hitting come back face of straight be born, some is in like a flock of golden butterfly forest flutter, really extremely beautiful. There is thick ginkgo part of a historical period everywhere in ginkgo forest, have a plenty of emerald, have a plenty of golden color, still have a plenty of olivine alternate with; Some leaf are general like cup mouth big, the small thumb armour with me builds similar volume. No matter be of what color, it is how big leaf, be sector.

I walk in incomputable small " fan " on, feel loosen again like stepping to go up in blanket soft. Suddenly, I feel to there is below the foot hard hard dot, raise a foot to look, ah! It is the small ginkgo fruit of a round lacteal yellow so. Sough of an autumn wind blows ginkgo tree is shaking off outfit of a suit gold in autumn wind, so good-looking, so Orphean: "Rustle, rustle " .

Just over the hot summer, we ushered in the cool autumn.

This Saturday and my mother to the countrys grandmother to play. We sat in the car, bursts of cool wind blowing, I can not help but hit a chills.

To the grandmother, I looked up at the blue sky, looked a lot higher than in the past. To the left to see a large field endless, rice becomes golden golden, from afar like a golden ocean. A gust of wind blowing, that endless rice field will play a golden wave, the ear seems to hear the sound of rustling. I walked forward, the red sorghum raised the black and red black and red face, like the joy of singing, I continue to move forward to see the piece of cotton, this cotton can not wait to come out from the shell , Like a white and fat kid.

I walked slowly on the ridge, next to the ridge with a lot of white wild chrysanthemum flowers, those wild chrysanthemum some budding, and some just blooming shame like a little girl. Fields with eggplant, corn and so mature.

Ah! Autumn is really busy, it brings people the joy of harvest!

Some people say that autumn is red, because one fall, Maple leaves are red; some say that autumn is yellow, because one to the fall, ginkgo leaves on the yellow; some people say that autumn is golden, because one to fall , The field becomes golden yellow ... ... no matter how others say, I think the autumn is colorful.

Every morning, the touch of the red day to the world, "called" played thousands of people in the sleep. This is the first color of autumn.

Morning, the sun has red to gold, the tens of thousands of gold to the world to sprinkle. At this time, people immediately full of energy, refreshed. This is the second color of autumn.

Afternoon, after lunch, people began to enjoy afternoon tea. Afternoon tea is generally coffee. This is the third color, brown.

Night, we are painting, writing, figure ... ... This is the color of paper, white.

At night, people went out to sleep. There is a black inside the lullaby, there are a bag of black hypnotic powder, black is the fifth color.

...

You see, fall is not colorful?

Autumn girl walked the silent footsteps, the beautiful autumn to the world.

She waved a magic wand, the green rice fields into a golden. Far from the field, the field like a golden carpet; field, the channel side, a small river, that tree green cypress, is embroidered on the carpet on the green side; ridge, grass, grow all kinds of Colorful flowers, is embedded in the carpet on the color of pearls. The cool autumn wind blowing, blowing on the rice, the rice thrown the golden waves; blowing in the trees, leaves fluttering leisurely fall, like butterflies dancing in the fields. I stand on the ridge, you listen, the wind blowing rice "rustling" sound, between the grass, the insects "tweeted" sound, the branches, the birds "grumble" sound, with our childrens laughter Sound, merged into a ensemble; like a symphony, played the harvest of the movement.

I love autumn, more love the field of autumn. Because she is full of joy, full of hope, full of vitality.

Autumn is here, autumn is here!

Autumn came to the fields, and autumn mother hurried to the fields and put on a golden dress. Rice, autumn wind blowing, Kingnet tumbling. Pods in the autumn wind accompanied by crashing singing the song of harvest.

Autumn came to the orchard, the apple smiled red face, pear, you squeeze my touch, just waiting for people to pick it! Persimmon trees are hung with persimmons like small lanterns. A string of grapes more attractive, sparkling like crystal clear Pearl agate.

When autumn comes to the garden, chrysanthemums bloom, red, white and yellow...... A riot of colours, bright and colorful flourish, very beautiful!

A fall weekend, my mother and I came to a farm, a step into the farm to see a golden field. So, my mother and I rushed in. We rushed to the middle of the rice, a gust of wind blowing, the rice Qiqiu bent down seems to bow to us! Suddenly, I found a cluster of rice below there is a planted stomach beans.

We continued to move forward, and saw the corn, a row of corn pen quite like a standing guard, each corn tree waist, long with a full of corn buds, corn buds at the top of a handful of Beard, this beard is thin and long, soft and slippery, green and thin and soft coating, layers of wrapped like a pearl-like water Lingling corn, looks lovely and tempting, I could not help, Bite a bite, a fragrant and sweet fruit flavor, really good. In the corn field, a root of red long dry beans hanging there, like a thin rope skipping.

Then we rushed into a plastic greenhouses, we saw a cucumber, a root cucumber hanging on the vine is very cute, and some like the moon, and some on the big, like a small gourd, Some are bent and bent, like a small ear.

Around the fields, with tall tall persimmon trees, trees hanging like a lanterns like red glowing persimmon.

Field came the rice machine "boom" voice, the farmers looked at the harvest of the field, harvested a year of effort, happy smile.

Spring is full of hope of planting, summer is full of management of fatigue, and autumn, it is full of the joy of harvest. Then in this joyful autumn I will carry the autumn yearning and curiosity, came to the grandfathers home orchard.

As soon as you enter the orchard, the aroma of the various fruits is blowing. And then saw an apple opened a smiling face covered with branches, it is a lovable. Take off one, bite, thin chew, a sweet taste will be in my heart. The wind blows, the sound of the rustling of the leaves and the sound of the streams that hit the rocks, and the play is a wonderful symphony. So that people relaxed and happy, deeply intoxicated.

Along the meandering path, go inside, one persimmon will be reflected in my eyes, so I was surprised and happy. This heavy persimmon one by one bending the branches, three clusters, five together to hold together, very cute. There is a pond next to the persimmon woods. The pond reflects the persimmon tree, it is a wonderful landscape painting. People met immediately fell in love with it, here linger.

Into the depths of the orchard, a pear will be it covered with "freckles" little face so that you love it. A little look, the tree parked a few birds, twittering cried, it seems to say: this years harvest can be really good, you see, that apple, that persimmon, that pear, one by one will be a big tree mother pressure Breathe. This is the farmer uncle hard labor in exchange for.

This is the autumn orchard, a farmer uncle with hard and sweat watering orchards.

Love AutumnI like autumn. I love the falling leaves in autumn. They cover the ground with golden yellow. When you walk on them, they rustle beneath your feet, just as if they are singing to you.

I know trees get ready for their next years rebirth by doing this, so I enjoy them without any sad feelings. The fields in autumn are fruity. People are easy to have good mood in a harvest season. So cant autumn sights bring happiness to us as well?

秋天Autumn

Autumn is the third season in the year. It lasts from September to November. When the autumn comes, the leaves begin to turn yellow and then fall. The weather becomes cool. It makes people feel comfortable. So many people like autumn and enjoy this season. Besides, autumn is a season of harvest. The crops turn to rip. Farmers are busy with the harvest. And they begin to prepare for the winter and the New Year.

秋天是一年中的第三个季节，从9月份开始持续到十一月份。秋天到来的时候，树叶开始变黄然后落下。秋天天气也变得凉快，让人感觉很舒服。所以很多人都喜欢并享受秋天这个季节。此外，秋天是收获的季节，庄稼成熟了。农民们忙于收获，他们开始为冬天和新年做准备。

Why do leaves change color in the fall? asks Patricia Brown, of New York City.

Autumns cool days are trimmed with deep blue skies and golden light, and brilliant leaves of yellow, orange and red. Leaves changing color in the fall are a trees way of preparing for long winter, rather like we put up storm windows and pull warm clothes and blankets out of storage.

In summer, the leaves on trees like pin oaks and sugar maples are green because they are chock-full of the green pigment chlorophyll.

Trees need sunlight to produce chlorophyll. In turn, chlorophyll uses sunlights energy to split water (H2O) into hydrogen and oxygen. Meanwhile, leaves also absorb carbon dioxide gas from the air. The end products of leaf chemistry: carbohydrates (homemade plant food for the tree), and oxygen, released into the air (the gas we need to breathe). The whole process is called photosynthesis.

Along with green chlorophyll, most leaves also contain yellow, orange and red-orange pigments celled carotenoids. Trees dont need light to make carotenoids. Botanists call them "helper pigments," because carotenoids absorb some sunlight and (nicely) pass the energy along to chlorophyll. We dont see much of these deputy pigments (carotene, lycopene, and xanthophyll) in summer, because they are masked by abundant green chlorophyll.

But the ever-shortening days of fall mean less daylight and colder weather. The average tree is rushing to save all the nutrients it can for its winter hibernation. Nitrogen and phosphorus are pulled from leaves for storage in branches. A layer of corky cells grows between the leaves stems and their branches, reducing the leaves supply of nutrients and water.

With diminished sunlight, water, and nutrients, chlorophyll synthesis slows. Old, worn-out chlorophyll breaks down at the usual rate--ironically, sunlight destroys it--so each leafs stock gradually dwindles. And as the green fades, yellow and orange emerge from hiding.

Unlike the green and yellow pigments, red and purple pigments (anthocyanins, part of the flavonoid class) actually form in leaves in the autumn, tinting leaves scarlet and burgundy.

Botanists have long wondered why some trees are genetically programmed to manufacture anthocyanins in the fall. New research indicates that anthocyanins may be a trees own sunscreen.

Anthocyanins are made in a leafs sugary sap, with the help of lots of sun and cool temperatures. Botanists think that anthocyanins shield the leaves fading photosynthesis factories from too much sunlight, rather like the pigment melanin protects our skin from the sun. While the red pigments act as a shield, the tree feverishly breaks down and pulls nutrients out of leaves and into its limbs and trunk before leaves drop or die.

Anthocyanins may also act like Vitamin C or E, scavenging so-called "free radicals" before they can do oxidizing damage to a fall leafs fragile structure.

Upper and outer leaves tend to be reddest, since they are most exposed to sunlight and cold. In some trees, like sugar maples, the reds of the anthocyanins combined with the yellows of the carotenoids make especially brilliant orange leaves.

[经典英语作文：秋天叶子为什么会变颜色