高中英语写信作文范文10篇带翻译(汇集20篇)

lwcool]the name christmas is short for "christ‘s mass". a mass is a kind of church service. christmas is a religious festival. it is the day we celebrate as the birthday of jesus. there are special christmas services in christian churches all over the world. but many of the festivities of christmas do not have anything to do with religion. exchanging gifts and sending christmas cards are the modern ways of celebrating the christmas in the world.

the birth of jesus had a story: in nazareth, a city of galilee. the virgin‘s name was mary was betrothed to joseph. before they came together, she was found with child of the holy spirit. joseph her husband was minded to put her away secretly. while he thought about these things, gabriel, an angel of the lord appeared to him in a dream and told him did not be afraid to take mary as wife. and mary will bring forth a son, and he shall call his name, jesus, for he will save his people from their sins.

before jesus births, joseph and mary came to quirnius was governing syria. so all went to be registered, everyone to his own city. joseph also went up out of galilee, out of the city of nazareth, into judea, to the city of david, which is called bethlehem, because he was of the house and of the lineage of david, to be registered with mary, his betrothed wife, who was with child. so it was that while they were there, the days were completed for her to bedelivered. and she brought forth her firstborn son, and wrapped him in swaddling cloths, and laid him in a manger, because there was no room for them in the inn.

and that, christmas is the feast of the nativity of jesus, is on 25th, december every year. but nobody know the actual birthday of jesus. and the christmaas has become popular when christmas cards appeared in 1846 and the concept of a jolly santa claus was first made popular in nineteenth century.

“圣诞节”这个名称是“基督彌撒”的缩写。彌撒是教会的一种礼拜仪式。耶诞节是一个宗教节。我们把它当作耶苏的诞辰來庆祝，因而又名耶诞节。这一天，世界所有的基督教会都举行特別的礼拜仪式。但是有很多圣圣诞节的欢庆活动和宗教并无半点关联。交换礼物，寄圣诞卡，这都使圣诞节成为一个普天同庆的日子。

圣诞节是基督教世界最大的节日。4世纪初，1月6日是罗马帝国东部各教会纪念那稣降生和受洗的双重节日、称为“主显节”epiphany，亦称“显现节”即上帝通过那稣向世人显示自己。当时只有那路拉冷的教会例外，那里只纪念耶稣的诞生而不纪念那稣的受洗。后来历史学家们在罗马基督徒习用的日历中发现公元 354年12月25日页内记录着：“基督降生在犹大的伯利恒。”经过研究，一般认为12月25日伴为圣诞节可能开始于公元336年的罗马教会)约在公元375年传到小亚细亚的安提阿，公元 430年传到埃及的亚历山大里亚，那路撒冷的教会接受得最晚，而亚美尼亚的教会则仍然坚持1月6日主显节是那稣的诞辰。12月25日原来是波斯太阳神(即光明之神)密特拉(mithra)的诞辰，是一个异教徒节日，同时太阳神也是罗马国教众神之一。这一天又是罗马历书的冬至节，崇拜太阳神的异教徒都把这一天当作春天的希望，万物复苏的开始。可能由于这个原因，罗马教会才选择这一天作为圣诞节。这是教会初期力

图把异教徒的风俗习惯基督教化的措施之一。后来，虽然大多数教会都接受12月25日为圣诞节，但又固各地教会使用的历书不同，具体日期不能统一，于是就把12月24日到第二年的1月6日定为圣诞节节期(christmas tide)，各地教会可以根据当地具体情况在这段节期之内庆祝圣诞节。自从12月25日被大多数教会公认为圣诞节后，原来1月6日的主显节就只纪念耶稣受洗了，但天主教会又把1月6日定为“三王来朝节”，以纪念耶稣生时东方三王(即三位博士)来朝拜的故事。随着基督教的广泛传播，圣诞节已成为各教派基督徒，甚至广大非基督徒群众的一个重要节日。在欧美许多国家里，人们非常重视这个节日，把它和新年连在一起，而庆祝活动之热闹与隆重大大超过了新年，成为一个全民的节日。12月25日的主要纪念活动都与那稣降生的传说有关。

耶苏的出生是有一段故事的，耶苏是因着圣灵成孕，由童女马利亚所生的。神更派遣使者加伯列在梦中晓谕约瑟，叫他不要因为马利亚未婚怀孕而不要她，反而要与她成亲，把那孩子起名为“耶苏”，意思是要他把百姓从罪恶中救出來。

当马利亚快要临盆的时候，罗马政府下了命令，全部人民到伯利恒务必申报戶籍。约瑟和马利亚只好遵命。他们到达伯利恒时，天色已昏，无奈两人未能找到旅馆渡宿，只有一个马棚可以暫住。就在這时，耶苏要出生了!於是马利亚唯有在马槽上，生下耶苏。后人为纪念耶苏的诞生，便定十二月二十五为圣诞节，年年望彌撒，纪念耶苏的出世。

圣诞节便是於十二月二十五日纪念耶苏的诞生，但真实的诞生日就沒有人知道了。十九世紀，圣诞卡的流行、圣诞老人的出现，圣诞节也开始流行起來了。

[圣诞节英语作文700字附带翻译

The street, people mountain people sea, beaming, against the colorful lights, neon lights, flash; Auto lamp, bright white, various, fantastic! Xinda street, heavy traffic, on both sides, the stall owners are selling beautiful balloon, different colors: red, yellow, blue, green, purple... . Form that vary: some blow grow winding, like a snake, somelike people smile face, there are various kinds of shape. Peoples vehicle is also different from ordinary, the car has a different decoration, like balloons, streamers and flowers and so on. Building, decorating, decorated, from the inside, outsidebusiness busy. Dance, the sky only colorful balloons, added the cheerful atmosphereto the Spring Festival. Most make a person happy that beautiful fireworks, firecrackers. Square, enthusiastic people putting the colorful fireworks, the best and the biggest shot a gun to shoot in the air, spread out a flower. And the flower on the ground, although it is small, power is also quite big, a light, spin, immediately issued a light, opened a little flower. Led adjustment by the smiling, like really, air spinning, then dance, finally finished BiBao shell exploded. A deafening noise, thefireworks blossom, beautiful!

Are happy New Year, Spring Festival is a festival, peoples life will be getting better and better.

dear eric,

My hometown is beautiful place It stands near a wide river at the foot of low green hills. It has many tall buildings and wide streets. There are trees and flowers everywhere.

But it has not always been like that. In the old days, it was a sad dirty little town. Landlords and merchants lived in the few good houses. For the working people there were only dark, unhealthy rooms in old buildings and huts in narrow muddy streets. Nearly everyone was poor and many had no work.

Everything has changed since liberation. The people, led by the Party, have got rid of the mud and dirt. They have put up schools, theaters, shops and flats. They have an assembly hall and a hospital. Along the river they have built offices, hotels and parks. A lot of factories have sprung up. On the river, streamers and boats come and go busily, day and night. They carry the products of our industries to all parts of the country.

I love my hometown, and I love its people. They also have changed. Healthy and happy, they are going all out to build socialism.

The first day to go to school, I am so nervous, but the moment I see the campus, I feel eased. There are so many trees and flowers around the school, it is like a garden, making people very comfortable. Now I will always walk around the school and appreciate its beauty. I like my campus so much and I am so proud of it.

上学第一天,我很紧张,但是当我看到校园的那一刻,我感到放松。学校周围有很多树和花,就像一个花园,让人很舒服。现在我总会围着学校走，去欣赏它的美。我喜欢我的校园,我为它很自豪。

[我的校园英语作文及翻译

Dear Tim,

With Spring Festival drawing near, I’d like to invite you to my home to experience the festival.

When you come, we can enjoy traditional Chinese food together, and then put up Spring Festival couplets. As a traditional custom, the couplets are always posted on the door of a house. Written on red paper, a couplet is composed of two lines of poetry, which rhyme with each other. Not only do the couplets add some joyous atmosphere to the festival, but also they express people’s wishes for a better life.

I would appreciate it if you could accept my invitation. Looking forward to your coming.

Yours,

Li Hua

It was sunny and hot today. I got up early at half past six. I read English

and then had breakfast. I helped my mother washed the dishes. Then I did my

homework and cleaned my room. I went shopping with my mother in the afternoon.

Then I played table tennis with my friends. In the evening I watched TV and read

a book. I really had a busy and interesting day.

今天天气晴朗，热。

我在6：30很早就起了床。我读英语然后吃早饭。我帮助母亲洗碗。然后做作业打扫房间。下午我和母亲去买东西。然后和朋友们打乒乓球。晚上我看电视、看书。我今天的确很忙、过得很有趣

Reading Is a Good Hobby

With development of science and technology, new knowledge comes every day. If you stop learning even for a day,you will be lost. Reading is a good way to help you keep in touch with the outside world. Read widely and youll be rich in knowledge. Reading is also a good way to relax yourself. You can get a lot of fun in the books. A good book is a good friend to comfort you when you are unhappy. So long as you have a good book at hand, youll never feel lonely. Every valuable book will open a new world before you.

随着科学技术的发展，新知识每天都层出不穷。只要一天不学，你就会落后。读书是一种与外部世界保持联系的好方式。广泛的阅读会丰富你的知识。同时阅读也是自我放松的好途径，你能够从书中收获很多乐趣。一本好书就像一个能在你不快乐时安慰你的好朋友。只要你手头有一本好书，你永远都不会感到孤独。每一本有价值的书都将在你面前打开一个新的世界。

读书是一个良好的习惯，希望同学们也有这个良好的习惯！

[读书是好习惯英语作文及翻译

Hello! My name is Mingming. I am a pupil. I like speaking English very

much. I go to school five days every week. Every day I go to school on foot.

Because my school is not near my home. I like my school. There are about 3500

students and 54 teachers in my school. And I study in Grade 4. There are 45

students in my class. My English teacher is tall and handsome . I love him very

much. Welcome to my school. You must be very happy.

你好!我的名字叫明明。我是一个小学生。我非常喜欢说英语。我每周要去学校五天。我每天步行去上学。因为我的学校不是在我家附近。我喜欢我的学校。在我的学校里大约有3500名学生和54老师。我在四年级学习。在我的班级里有45个学生。我的英语老师又高又帅。我非常喜欢他。欢迎来到我的学校。你一定很开心。

我们都邻国。好邻居胜过远亲。这是共同的，我们可能会与遇到困难.当我们好邻居，他们将永远来帮助您。邻国应该在与对方。

我的邻居，有一个女儿。我们是同龄，但我们不要? T研究在同一所学校。晚上我们总是一起做功课。她擅长数学，我很擅长英语。因此，我们经常互相帮助来自作文

Good Neighbours

We all have neighbours. A good neighbour is better than a distant relative. It is common that we may meet with difficulties.When we have igood neighbours, they will always come to help you. Neighbours should get on well with each other.

My neighbour has a daughter. We are of the same age but we don~t study in the same school. In the evening we always do homework together. She is good at maths and I am good at English. So we often help each other.

A new year,a new start,when i stand on the edge of a new year,i cant help thinking about my plan of next year.

just as the old saying:"well began is the half of the success.”so i decide that i should be at work while the others are still relaxing,and then,at the beginning,im quicker than the others and of course i will get better result than the others.

But,what i really decide to do is that i must make good of anytime i can spare though it seems impossible. while,i will do my best to live up with what i have planned,and the result will prove it.

新的一年，新的开始，当我在新的一年的边缘立场，我不禁在想我明年的计划。

正如古人云：“好开始是成功的一半”，所以我决定，我应该是在工作，而另一些性传播疾病就会放松，然后，在开始时，我比其他人更快，我当然会得到比别人更好的结果。

但是，我真正决定做的是，我必须利用好，我可以随时备用，虽然它似乎是不可能的。虽然，我会尽我所能，用我生活已计划了，结果将证明这一点。

噢耶！过年喽！吃年夜饭了！”我高兴地到处嚷嚷。

除夕之夜是一家人团聚的时刻，俗话说得好：“有钱没钱，回家过年。”这一天是中华民族团聚欢乐的好时光。

我家也不例外，妈妈和姥姥做年夜饭，爸爸和姥爷贴春联，我呢在楼下和小伙伴玩鞭炮，大家都忙得不亦乐乎。

随着“久经菜场”的妈妈一声大喊：“上菜了……”拉开了年夜饭的序幕。望着这一桌热气腾腾的年夜饭，我馋得口水直往肚子里流。妈妈指着一盘红烧鲤鱼说：“这是‘年年有余’！”姥姥指着红烧鸡说：“这是‘吉祥如意’！”爸爸与姥爷碰杯进酒：“祝您老福如东海，寿比南山！”并夹起青菜对二老说：“这是长庚菜，祝您二老长命百岁。”姥爷捋捋胡须，夹起用玉米粉做起的龙须饼说：“这是‘双龙戏珠’该外孙吃，争取考双百！”我开玩笑地回答：“考试有四门呢！”“哦，那就再夹两个！”姥爷乐呵呵地又往我的碗里夹了两个，“那就考两个双百!”“好，好!”我狼吞虎咽地吃了起来……

这时，姥爷笑咪咪地说：“我来给大家发红包，前提是每人必须回答一个问题。”大家顿时安静了下来。“老婆子，请听题：“长长一串，一爆赛过红豆子。”姥姥稍思片刻说：“爆竹。”“中奖！”姥爷乐呵呵得将红包递给了姥姥。

后来姥爷又对爸爸说：“小小一个本，计算是第一。”爸爸脱口而出：“是计算机。”爸爸笑嘻嘻地接过了红包。

“外孙，该你了。我来考考你的数学，5×6×3.14等于多少？”我思考了一下：“等于94.2。”“正确！”我也赢得了一个红包。

“女儿，你是家庭主妇，我问你，什么东西越洗越小？”“肥皂。”妈妈也顺理成章地得到了一个大红包。

屋内笑声阵阵，屋外鞭炮声声，这也正应了门外那副春联：四海为春春不老，九州同乐乐无穷。

People travel by plane, by train, by ship, by bus. To me, the best way of traveling on a summer vacation is to go on foot.

My preference depends on the purpose of the travel. On a summer vacation I travel to refresh myself and to see the countryside. When I use my feet and walk on a grass covered path along a river or among the hills I feel detached from the noise of the city and closer to the nature. And when I travel on foot I get more freedom. I can plan my own schedule. I can choose my own route. I can stop where I like. And I can see things and people that I might miss if I travel on a train or on a bus. net

When faster and more convenient ways for travel are becoming available, I still favor using my own feet. I get much pleasure from it. People travel by plane, by train, by ship, by bus. To me, the best way of traveling on a summer vacation is to go on foot.

[最好的旅行方式高中英语作文

以下是英文写作翻译频道为大家整理的《简单英语作文翻译：关于运动会的谈话》，供大家参考。

Hi,Jack,we’re going to have our school sports meeting on the playground next week.It will last three days from Thursday to Saturday.We have many competitions in running,such as 100-metre race,200-metre race,400-metre race and the .Please be on time,wear your sports shoes and take a bottle of water. Good luck to you!

嗨，杰克，我们要有我们学校的运动会在操场上下周。它将从星期四持续到星期六三天。我们在跑步比赛，如100米跑，200米跑，400米跑和接力赛。我们也有跳远，跳高等等。我知道你很擅长跑步。请参加男子400米的比赛， 星期五上午10:30，请准时，穿上你的运动鞋，带上一瓶水。祝你好运！

Today was Sunday, I was so happy because our family had a big meeting, we went to the park to have the barbecue. We called our relatives to join us, it was such a great party. As the family members haven’t got together for a long time, so my father decided to get everybody united. In the park, I played with my cousins, we were taking a visit of the park while the parents were doing the barbecue.

When my counsins and I played so tiredly, we went to join the grow-ups’ activities.

The fathers were talking about the business stuff, while the mothers were talking about the children and their daily life. Our family was so harmonious, we shared the things together and helped each other. I like this activity so much, I wish my families can have more time to be together.

今天是星期天，我很开心，因为我们的家庭有一个大聚会，我们去公园烧烤。我们叫上了亲戚来加入，这是多么盛大的派对啊。由于家庭成员间很久没有在一起了，因此父亲决定把大家团聚在一起。在公园里，我和表亲们在玩，我们在参观公园，而家长们则在烧烤。在表亲们和我玩累了，我们就加入大人们的活动。父亲们在谈论生意上的事情，然而母亲们在谈论孩子和日常生活。我们的家庭是那么的和谐，一起分享东西和彼此帮助。我很喜欢这样的活动，我希望我的家人们能有的时间相聚。

[高中英语作文：家庭烧烤

The Dragon Boat Festival, must not not include dumplings! Today, my sister is teaching me the dumplings! You see.

Make zongzi must be prepared. My sister was ready to soak for three hours of glutinous rice and bought the leaves, which surprised me.

I put my rice in the leaves, and I was all over the table, and I was angry. My sister said to me, "you want to make a triangular shape of the leaf and put the rice in it!"

So I did what my sister said, and pressed it on the rice. Whats in the middle of that dish? It was minced meat! I dug a small hole in the middle of the glutinous rice and made it into a round shape, stuffing it into glutinous rice and adding it to the glutinous rice. How can you seal it? I looked at my sister and knew everything.

I pressed down one of the warped leaves and pressed the rope hard. Success! I covered a lot of them in the previous method. Now its time to get the pot down, boil the water first, and then put the dumplings on.

After a while, the dumplings were cooked. The four of you sat at the table and ate the dumplings.

I untied the rope and was trying to remove the leaves, but when I touched it, it was hot. Her sister looked and laughed. I blew and blew the heat away. I again carefully will leaves open, eat up to her delicious dumplings - among all be stuffed glutinous rice, wrapped in a delicious meat, fresh juice in your mouth, no oil is not greasy, and chewy, feels so good!

So the Dragon Boat Festival in the past, his mouth to eat with his hand package dumplings, thought the tang dynasty poet du fu wrote poems: palace clothing is famous, dragon boat be reward. The wind is soft and the snow is light. When the weather is wet, lets go to the heat. The meaning is the length of the word, the whole life.

What a happy Dragon Boat Festival!

过端午节，一定少不了粽子!今天，姐姐就在教我包粽子呢!你瞧。

做粽子一定要有准备的。原来，姐姐已准备好浸泡了3个小时的糯米，同时也买好了粽叶，这样准备就让我大吃一惊了。

我把米放在叶子里，可米全撒在了桌上，我生气极了。姐姐对我说：“你要把叶子做成一个三角形的样子，然后再把米放进去啊!”

于是，我按照姐姐说的步骤作了一遍，在米上按了按，咦?旁边那个盘子中间放的是什么?原来是肉馅哦!我在糯米中间挖了一个小洞洞，把肉馅弄成圆状，塞入糯米中，让它也加入糯米的行列中。可怎么封好呢?我看了眼姐姐，就明白了一切。

我把翘起来的一片叶子按下来，并用绳子用力的扎紧。成功啦!我按照前面的方法，包了好多个。现在就要下锅了，先是把水烧开，然后把粽子放下去。

过了一会儿，粽子煮好了。大家四人坐在桌子旁，吃起了粽子。

我把绳子解开，正想把叶子摘掉，可我一碰，就被烫着了。姐姐看了，哈哈的笑了起来。我吹着吹着，把让热气吹走了。我再次小心翼翼的将叶子掀开，吃起了自己亲手做的香喷喷的粽子来——白白胖胖的糯米中间，包着一团鲜汁可口的肉馅，放入口中，不油不腻，又有嚼劲，感觉太好了!

端午节就这么过去了，嘴里吃着自己亲手包的粽子，心里想着我国唐代诗人杜甫写的诗：宫衣亦有名，端午被恩荣。细葛含风软，香罗叠雪轻。自天题处湿，当暑着来清。意内称长短，终身荷圣情。

这真是一个快乐的端午节!

我有个姐姐。她的名字叫胡丹。20岁，是一名高中生。

她有一张圆脸，两只明亮的大眼睛和一个小鼻子。她的头发很长.她最喜欢的颜色是蓝色。最喜欢的运动是网球。春天里她经常和我打网球。

她擅长画画。她画的画很美。我喜欢看她画画。

她很和善、友好，喜欢助人为乐，因此她有很多好朋友。

这就是我姐姐。我非常喜欢她。

i have a sister. her name is hu dan. she is twenty years. she is a high school student.

she has a round face, two big , bright eyes and a small nose. her hair is long. her favourite colour is blue. her favourite sport is tennis. in spring,she often plays tennis with me.

she is good at drawing. her drawings are very nice. i like watching her draw pictures.

she is kind and friendly. she is always ready to help others,so she has many good friends.

this is my sister. i like her very much.

How to protect the environment?

Nowadays, more and more people realize it`s necessary and important to protect the environment. Also,there are some people who don`t pay attention to hygiene and they can`t stop littering the rubbish casually or spitting everywhere all the time.And in addition, there are a few factories often cutting down the trees, discharging chemicals and dirty water and so on.And it causes many problems like the Greenhouse Effect.If they do these day by day and our life will be harder and harder,so we have to stop them. To stop them we can put up commonweal advertisements and tell them the detriment of destroying the environment.So we can start from now to make a beautiful life.

如何保护环境?

现在，越来越多的人意识到保护环境是必要和重要的。同时，也有一些人不`不注意卫生，他们可以`停止乱扔垃圾垃圾随便或随地吐痰的时候。此外，还有一些工厂经常砍伐树木，排放的化学物质和脏水。这引起了诸如温室效应等问题。如果他们天天这样做，我们的生活会变得很困难，所以我们必须阻止他们。为了阻止他们，我们可以提出公益广告，并告诉他们破坏环境的危害，所以我们可以从现在开始做一个美好的生活。

这个节日的由来逝代中国有一位博学多闻的官吏屈原，他是一位爱民而且又受到尊崇的官吏，但是由於一位充满嫉妒的官吏陷害，从此在朝廷中被皇帝所冷落。由於无法获得皇帝的重视，屈原在忧郁的情况下投汨罗江自尽。

由於对屈原的爱戴，汨罗江畔的居民匆忙的划船在江内寻找屈原，并且将米丢入汨罗江中，以平息汨罗江中的蛟龙。即使他们当时并没有找到屈原，但是他们的行为，直到今天在端午节的时候，仍然被人们传颂纪念著。

The origin of this summer festival centers around a scholarly government official named Chu Yuan. He was a good and respected man，but because of the misdeeds of jealous rivals he eventually fell into disfavor in the emperors court.

Unable to regain the respect of the emperor，in his sorrow Chu Yuan threw himself into the Mi Low river. Because of their admiration for Chu Yuan， the local people living adjacent to the Mi Lo River rushed into their boats to search for him while throwing rice into the waters to appease the river dragons.

Although they were unable to find Chu Yuan，their efforts are still commemorated today during the Dragon Boat Festival.

我的朋友

My best friend is Mary. She lives in a tall building. She lives on the fifth floor. Everyday she takes the lift up and down. She is twelve years old. She is tall and thin. She has short black hair，two big eyes and a small mouth. She is very cute. I like playing with her. We are in the same class. I like to read books but she likes playing games. She likes to eat popcorn and ice creams. I like them， too. Her favourite food is fish， so she is clever. She loves her cat. She often plays with her. The cat likes Mary，too. They are cute.

这篇是讲述我的好朋友玛丽。介绍她的住址，她住在一幢高楼里。她住在五楼。她的年龄，她十二岁。她的外貌，她又高又瘦。她有短的黑色的头发，两只大眼睛和一个小嘴巴。

Yesterday my classmates and I went to on a picnic. According to our plan we would climb the West Mountain.

昨天我和我的同学去野餐。按计划要爬西山。

Early in the morning all of us gathered at the gate of our school, we started of at seven, soon it began to have a little rain. We kept on riding for an hour till we reached the foot of the mountain.

清晨，我们都聚集在学校门口，我们开始在七，很快就开始有一点雨。我们骑了一个小时，直到我们到达山脚下。

The little rain stopped then. We began to climb. Soon we reached the top of the mountain. How beautiful it was when we looked at the view from the top. We ran. sang, jump,

小雨停。我们开始爬山。我们很快就到达了山顶。它是那么美丽，当我们在山顶上看风景。我们跑了。唱歌，跳，

played chess, and had the pictures taken on the top of the mountain. and had lunch on the rocks. How happy we were!

下棋，还拍了照片在山顶。吃午餐的岩石上。我们是多么幸福!

After the lunch we went down the mountain. We got home at four, all of us almost gave out.

午饭后，我们下山了。我们四点到家，我们都筋疲力尽了。

Oceans becoming more acidicThe worlds oceans are slowly getting more acidic, say scientists.The researchers from California say the change is taking place in response to higher levels of carbon dioxide in the atmosphere.The lowering of the waters pH value is not great at the moment but could pose a serious threat to current marine life if it continues, they warn.Ken Caldeira and Michael Wickett, from the Lawrence Livermore National Laboratory, report their concerns in the journal Nature.Increasing use of fossil fuels means more carbon dioxide is going into the air, and most of it will eventually be absorbed by seawater.

Once in the water, it reacts to form carbonic acid.Scientists believe that the oceans have already become slightly more acidic over the last century.But these researchers have tried to predict what will happen in the future by combining what we know about the history of the oceans with computer models of climate change."This level of acidity will get much more extreme in the future if we continue releasing CO2 into the atmosphere," said Dr Caldeira."And we predicted amounts of future acidity that exceed anything we saw over the last several hundred million years, apart from perhaps after rare catastrophic events such as asteroid impacts."If carbon dioxide release continues unabated, ocean pH could be reduced by as much as 0.77 units, the authors warn.It is not absolutely clear what that means for marine life, however.

Most organisms live near the surface, where the greatest pH change would be expected to occur, but deep-ocean lifeforms may be more sensitive to pH changes.Coral reefs and other organisms whose skeletons or shells contain calcium carbonate may be particularly affected, the team speculate. They could find it much more difficult to build these structures in water with a lower pH.In recent years some people have suggested deliberately storing carbon dioxide from power stations in the deep ocean as a way of curbing global warming.But Dr Caldeira said that such a strategy should now be re-considered."Previously, most experts had looked at ocean absorption of carbon dioxide as a good thing - because in releasing CO2 into the atmosphere we warm the planet; and when CO2 is absorbed by the ocean, it reduces the amount of greenhouse warming.