关于梦想的英语作文初中生（汇编20篇）

Live with thankfulness Do you know Thanksgiving Day?Do you know why human thank God? Thanksgiving falls on the fourth Thursday of November, a different date every year. The President must proclaim that date as the official celebration.

Thanksgiving is a time for tradition and sharing. Even if they live far away, family members gather for a reunion at the house of an older relative. All give thanks together for the good things that they have. In this spirit of sharing, civic groups and charitable organizations offer a traditional meal to those in need, particularly the homeless. On most tables throughout the United States, foods eaten at the first thanksgiving have become traditional. What should we thank?

The thankful great universe provides the environment of existence for us and give us sunlight, air, water and everything in keeping with we existence of space, bring storm to let us accept to toughen for us, bring to us mysterious let us look for. The thankful parents give us the life, make us feel the merriment of the human life, feel the genuine feeling of the human life, feel the comity of the human life, feel happiness of the human life, also feel hardships and pain and sufferings of the human life!

The thankful teacher works with diligence and without fatigue everyday of teach, give us knowledge ability, put on the wing which flies toward the ideal for us. The thankful classmate and friend grows up road of, let I no longer standing alone in the itinerary of life;The with gratitude is frustrated and let us become in a time the failure stronger.

[ 多与家人朋友沟通交流初中英语作文

My favourite teacher is Miss Meng.shes my new math teacher.Her class is very funny.Shes tall and thin.Shes pretty.Shes very very smart and active.Shes strict,but shes very kind.Her fevourite food are tomatoes.She often reads books on Saturdays and Sundays.

This is my fevourite teacher.I like her!

[我的老师初中英语作文

一行飞雁划过苍穹，留下一条优美的弧线，渐行渐远，最终消失在视线，它们要去往何方？我想，大概是在向着璀璨的阳光，追逐自己的梦想。

曾经那些稚嫩的孩童，如今已长成个怀揣信念的少年。我们用五颜六色的粉笔，勾画着青春的蓝图。

是什么让我与文字结下了不解之缘，我喜欢在暖意洋洋的午后，捧着一本书在着茶香的屋子看尽人间百态，与作家进行心灵的碰撞，擦出智慧的火花。渐渐地我爱上了散发着墨味的书，梦想着有朝一日自己写一本书，向你述说我的故事。初三，我更深入的浅入到文字的海洋，累积了炫丽的词汇，收集了更多的情感。依稀感受到这个梦在耳边萦绕，催促我加快自己的步伐，向着成功的彼岸进发，希望不久的未来，可以沉醉在自己笔下的故事中，心随着波澜曲折的情节跌宕起伏。

外面的世界五彩斑斓，外面的世界充满着未知的精彩。虽然我现在沉没在初三这个为考试而奋斗的时代，但大千世界像一块磁铁，吸引着我的目光。手中各种试题像一个调皮的孩子，漏出狡黠的笑容：“想要走出去，相过了我这关再说”！学习压力虽大，依然阻碍不了我渴望飞翔，常常握紧拳头，下定决心要以优异的成绩在同龄人中出类拔萃，考上一所好大学，然后出国继续深造。有了能力具备了条件，可以飞行的更远，去观赏想要游览的世界风采。一定不能使自己禁锢在这样一个小城市，要让灵魂随着风儿漂洋过海，到那时，我也一定会怀念现在的初三，那段孕育希望与梦想同行的岁月。

哪一个青春的少年胸膛中不在跳着火热燃烧的心，有梦想就去拼搏，有追求就去努力，不为人生留下遗憾，这就是我们的信念，前进的脚步永不停歇。

[梦想与我同行初中作文

考辅P42

1. I gave Tom the book. ／／

2. He bought his mother some flowers. ／／

3. The bridge was built by workers last year.／／

4. We have to finish the work today. ／／5. He will do his homework tomorrow. ／／

6. We clean the rooms every day. ／／7. The writer spent 3 years on the book. ／／

8. It is a book with a lot of beautiful pictures.／／

9. The book sold very well during the first week. ／／first week.

10. Mary was the only one in the office. ／／

11. She finished her work at 10 o’clock. ／／She didn’12. She had to take a taxi home because it was too late.

13. Liza and Mike arrived at the Great Wall in two hours.

14. They were happy to get to the top.／／

15. They enjoyed themselves on the Great Wall.／／

16. The postman sent Susan and Tommy a paper box.

17. They opened it and found a present from their friend.

18. They both liked the present and felt very happy.

19. Alice didn’t feel well today, so she went to the hospital.

20. The doctor asked her some questions. ／／

21. The doctor didn’t give her any medicine in the end.

（全真１）

1. The capital Airport has been in use for 20 years. ／／

2. The capital Airport is the largest one in China. ／／

3. I have never taken a plane. My friend Li Ping , either. ／／

（全真２）

1. Father gave $20 for me to buy some books. ／／

2. I was excited when I saw so many good books in the bookstore.

3. But some books would cost more than I have. ／／

But I didn’／／（全真3）

1. Many Chinese friends went to the party. 2. Tony was given a lot of presents by his friends. ／／Tony’

3. Seeing his Chinese teacher at the party made Tony very happy. ／／（全真4）

1. I want to eat something. ／／2. The refrigerator is empty.／／3. Bob spent fifteen yuan on the hamburger. ／／／（全真5）

1. Mr.Wang doesn’t work in that factory any longer. ／／

2. Mr. Wang left home earlier in order to catch the bus. 3. Mr. Wang finds it not easy to get along with that young guy. ／／（专家1）

1. Many people went shopping yesterday.

2. Jane spent 4 hours to buy New year gifts. ／／

3. She was so tired that she couldn’t walk any longer. ／／

（专家2）

1. My friends said to me, “Are you free?”

2. She wanted me to go shopping with her.

3. She thinks it a pleasure to go shopping with a friend.

Everyone has their own dreams.Dream is the start of success.When we have a

dream,the only thing we should to do is make it come ture.

I have a dream.My dream is to be a computer programmer,who can create

software or computer games.I like computer.When the first time I met computer,it

attracted me immediately.Of course,to be a good programmer is difficult,but I

think I can make it.

Now everything I do is close to my dream.I feel my life is fill with hope

and is colorful,and I have enough confidence to realize my dream.I’ll work hard

for my dreams,I will never give up.

The Dragon Boat Festival is a lunar (阴历)holiday, occurring (存正)on the fifth day of the fifth lunar month (农历史五月第五天)

The Chinese Dragon Boat Festival is a significant (有意义的)holiday celebrated (庆祝)in China, and the one with the longest history (历史最悠久). The Dragon Boat Festival is celebrated by boat races (龙舟赛) in the shape of dragons. Competing teams (竞争团队) row their boats forward to a drumbeat (击古)racing to reach the finish end first.

The boat races during the Dragon Boat Festival are traditional customs (传统习俗)to attempts to (试图)rescue (搭救) the patriotic poet (爱国诗人)Chu Yuan. Chu Yuan drowned (溺死) on the fifth day of the fifth lunar month in 277 B.C. Chinese citizens now throw bamboo leaves (竹叶) filled with cooked rice into the water. Therefore the fish could eat the rice rather than the hero poet. This later on turned into the custom of eating tzungtzu and rice dumplings(棕子).

The celebrations is a time for protection (防护) from evil (邪恶) and disease (疾病) for the rest of the year. It is done so by different practices such as hanging healthy herbs on the front door, drinking nutritious concoctions (营养品), and displaying (展示) portraits (画像) of evils nemesis(邪恶报应), Chung Kuei. If one manages to (成功做...) stand (直立)an egg on its end at exactly 12:00 noon, the following year will be a lucky one.

梦想这两个字，在我的心里有一半是被封印的，很像是我的心一半见了光，而另一半是不曾见过几日光明的。很久了，久的差点我都快忘了，快忘记自己曾为那个呆在黑暗角落的梦那么的努力，一次次的摔倒，然后一次次的又站起来,循环着，循环着无数次。每个晚上偷偷流的泪已经数不清了，多少个不眠之夜也跟着星星在那苍穹中度过去了。我无时无刻都在思考着，然后红了眼眶强忍着泪水跟说着我没事。我有时嘲笑自己的倔强与看似坚强的脆弱，一个人像个小丑那般为着那个不被人支持的梦想坚持着。 Dreams of dreams are seal in half in my heart, which is like half of my heart, and the other half has never seen it beforeA few days of light.For a long time, I almost forgot for a long time. I forgot that I had worked so hard for that dream of staying in the dark corner. I fell again and again, and then stood up again and again, circulating, and circulated countless times.Every night, the tears that secretly flowed had been countless, and how many sleepless nights followed the stars in the sky.I was thinking about it all the time, and then I had red eyes and endured tears and said that I was okay.Sometimes I laughed at my stubbornness and seemingly strong fragility, and a person insisted on the dream that was not supported like a clown.

我原本就是大山里的孩子，在我说出那个支教梦是被所有的人一口否决，他们侮辱着支教这两个字，让我趁早放弃。我用淡淡的哦字小心翼翼的维护着我那强烈的自尊心，可是我很倔，认定了的事就不会轻易放弃，所以我把那个梦想埋在我的心里。

慢慢的，索性我就不说出那个支教梦来了，而在心里表层的是作者梦。这两个梦并不冲突，我一直都在为之努力，努力超越昨天的自己，我一点点的进步，就算结果可能不是那么尽我的意我也会安慰着自己。可是当我听到支教在别人口中是那么的落后，是那么的不堪，我会很伤心会反驳他们，然后自己没出息的去哭，用民谣来麻痹我的内心。

我知道有梦就要大声说出来，但我怕，怕某一天我会崩溃，我会放弃这一切，会恨自己，会变得很自私。我更怕我小心翼翼维护着的自尊心会在某一刹那被击垮的支离破碎。那个支教梦我就索性不说了我不想自己伤自己，我会努力，让他们刮目相看，让他们觉得我的支教梦也可以很好。可能有人会觉得我很自私，有梦却不说出来还算什么梦啊。其实我也自己这样想过，可是我真的不知道我该怎么办了。

我不会悔恨我的出生，我也不会放弃这个支教梦，因为我知道这个世界上还有更多的人在为着同一个梦想而努力着。说与不说好像也已经不那么重要了，重要的是能否保持一颗初心，能否坚持下去吧。现在的我，现在的这个梦，已经释然了。

开头

1.关于……人们有不同的观点。一些人认为……

Therearedifferentopinionsamongpeopleasto____.Somepeoplesuggestthat____.

2.俗话说（常言道）……，它是我们前辈的经历，但是，即使在今天，它在许多场合仍然适用。

Thereisanoldsaying______.Itstheexperienceofourforefathers，ho博文学习网:初中英语作文结尾句子)haveeverseen.姚明是我所见过的最高的篮球运动员

HelenisthemostbeautifulgirlthatIhaveeverseen.海伦是我所看过最美丽的女孩

二、Nothingis+...erthanto+V

Nothingis+more+adj+thanto+V}比较级

Nothingismoreimportantthantopotectourenvironment.没有什么比环保更重要的事

三、cannotemphasizetheimportanceoftoomuch.再怎么强调......的重要性也不为过

Wecannotemphasizetheimportanceofprotectingoureyestoomuch我们再怎么强调保护眼睛的重要性也不为过

四、Thereisnodenyingthat+S+V...（不可否认的……）

Thereisnodenyingthatthequalitiesofourlivinghavegonefrombadtoworse不可否认的，我们的生活品质已经每况愈下

五、Thereisnodoubtthat+句子~~（毫无疑问的……）

Thereisnodoubtthatoureducationalsystemleavessomethingtobedesired.毫无疑问的我们的教育制度令人不满意

六、Anadvantageof~~~isthat+句子（……的优点是……）

Anadvantageoftakingexercisesisthatitcanmakeuskeephealthy.锻炼身体的优点是它可以让我们保持健康

七、Thereasonwhy+句子~~~isthat+句子（……的原因是……）

Thereasonwhywehavetogrowtreesisthattheycanprovideuswithfreshair.我们必须种树的原因是它们能供应我们新鲜的空气

八、So+形容词+be+主词+that+句子（如此……以致于……）

Sopreciousistimethatwecantaffordtowasteit.时间是如此珍贵，它经不起我们浪费

九、Itisuniversallyacknowledgedthat+句子~~（全世界都知道……）

Itisuniversallyacknowledgedthattreesareindispensabletous全世界都知道树木对我们是不可或缺的

[初中英语作文结尾好词好句

We are always told that time is precious so that we shall cherish it. Even

though most of us know the necessity of making use of time, when we start our

plans, we find that time is limited. Where has the time gone, we always feel

confused about it. Actually, it is the lack of efficiency that makes people feel

time is not enough. It is in need of improving efficiency. Most students cant

focus their mind on study because they think of all kinds of temptations, such

as delicious food and computer games. If they can finish task quickly, then they

can do other things. It is the motivation to improve efficiency.

我的梦想My Dream

Different people have different dreams。 Some people dream of making a lot of money。 Some people dream of living a happy life。 Some people dream of being famous。 Some people dream of going abroad， and so on。 But my dream is different。 Maybe you will get a surprise after you know my dream。[由www.duanmeiwen.com整理]

不一样的人有不一样的梦想。有些人梦想赚很多的钱。有些人梦想过上幸福的生活。有些人梦想能够出名。有些人梦想能够出国等等。但我的梦想是和他们不一样的。明白我的梦想后也许你会很惊讶。

There are various kinds of jobs in the world, but different people are

attracted by different jobs because everyone has his own interest and

destination. Many people consider an ideal job as a means of making more money

and living more comfortably. It may sound reasonable because money is the

foundation of life.

As far as my ideal job is concerned, I think I want to be a psychologist, I

have made up my mind to do what I really want to so that I can realize my ideal,

I believe interest is of the utmost importance in choosing a job, I have been

interested in psychology for a long time, so I want to be a psychologist in the

future, I think being a psychologist can help lots of people lead a happier

life.

However, it isnt easy for me to become a qualified psychologist and many

people around me think that its unrealistic to me. NevertheLess, Ill make

every effort to gain much more knowLedge, patience, methods, etc. to live up to

the name of a qualified psychologist. I believe my dream will come true

someday.

“有经历才有成长，有失败才有成功，有梦想才会有动力，有想象就有现实”，这句话变成了我现在的真实写照。我来自于西安一个普普通通的小乡村，说起来也有点可笑，自从我离开学校踏入社会以来，我感觉我只拥有每一段话的前半部分。在我经历过的许许多多中，我就是一个跳梁小丑。但是小丑也有自己的生活，不管自己的生活是如何，毕竟是属于自己最真实的一场记忆。

话还得从前几个月开始说起，那天学校发表格让自己填写自己的实习单位，其中有一栏上面写道是“服从学校安排实习还是自己找”，反正大致上是这么个意思吧！那会的我信誓旦旦说那肯定是自己找啊。

我竟然大言不惭的说：“现在都啥时候了，一个实习的地方么，有什么不好找的，毕竟我是一个大学生呢，那么多没上过学的都可以找到工作，我不可能连个实习的地方都没有吧！”现在回忆起来，感觉那时候没有进入到社会的我是多么的可笑与无知。可能那个时候，我便成为了那个穿梭于梦想与现实之中的“小丑”了吧！

时间不等人。那天考完最后一科考试后，我心中无比的轻松与释然，因为那会傻傻的在心里想着这是我人生中的最后一场考试了，开心的笑了。收拾好东西踏上了回家的旅途……第二天我便踏上了寻找工作之旅，我在58上发布了我的简历之后，有好几家公司都给我安排了面试，我便开开心心的去了，一家接着一家的面试。一直过去了好久好久，所有面试我都去了，好累好累……

我对自己抱着万份的信心说一定有一个好工作等着我，可是现实这东西狠狠的扇了我一巴掌，等了好多天，所有的公司都再也没有与我联系。我终于醒来了。晚上，我行走在市里的街道上，那份无助与苦闷一下子浇灭了我的心，看着行走在街道上形形色色的人们，我站立在那里，瞬间就感到自己已然成为了一个无人过问的-“小丑”。

你们知道在父母面前大言不惭的说“一个工作么，那不是信手拈来的事情么。”然后回到家中那种没脸面对父母的心理么？我是深深的体会到了。

现实中，好多小丑与我们相伴。很多情，麻木的去承受是无法解脱的，人的疲惫感其实是与生俱来的，否则就不会有睡觉这样一个无师自通的状态。很多事，强硬的记住是无法清晰回忆的，时间不仅仅可以愈合伤口，更会慢慢磨灭你对过去那些全部记忆，留有的也是零零碎碎，也许是一句话，即使它没有相应的对白。

我终于明白了，小丑就应该扮演好自己小丑的角色，只有努力了，才会得到自己想得到的。

[初中优秀作文穿梭于梦想和现实中的“小丑”

The rain outside the window rhythmic in the beat the glass, the rain rhythm of the next non-stop. Wake up in the morning, and feel a lot of cool days. The ancients have sad autumn that I think this view may be the face of changes in the weather caused by the reasons.

Summer scenery is not dead in the brain, that hot weather, dense forests, grass, bright flowers impressed, she is bright, up, warm feeling, she is yang floating in the human body surface, gas Blood is surging, the mental condition is not the same.

The same is a piece of land, the season has changed, the impression is different. Trees, flowers are withered and dying. The autumn wind began to appear depressed, desolate scene, peoples hearts spontaneously produce sadness is self-evident.

Autumn rain led the changes in the season, gave birth to peoples sadness. So the ancients described the fall rain is often Denglou Wangxiang, see flowers and dying, bustling scene disappeared, a desolate scene.

Autumn rain is still beating the earth, people in the harvest harvest fruit, spring autumn autumn to bring people the joy of harvest.

Autumn rain in the wake of peoples desire for knowledge, semester school, students in the book to seek new knowledge, to explore the peak of science and technology. Autumn rain in the moisture of the earth, gave birth to a new life, to meet the arrival of the next season.

Autumn rain in the wash the earth, show eyes and some of the deep landscape. Autumn rain in the story of the occurrence of a year, whispered the priorities, is right and wrong ... ... autumn rain you enjoy singing it, the earth, all things open arms to meet you!

I have many dreams， such as I am rich in the future。 Therefore， I can buy all what I want。 But my greatest dream is that I want to be an astronaut。 Our country develops fast and our space make great progress in the last several decades。 It has great achievements。 All of our country are proud of it。 Therefore， I want to be one of this amazing area。 In order to make my dream e true， I must work hard now。 So that I can go to a good university to learn more knowledge。 I hope my dream can e true one day。

梦想是人类对未来美好的愿望，梦想跟现实差不多，理想是人生道路上的灯，为你照亮前进的道路；那么梦想呢。理想是人生道路上的坐标，为你指明前进的方向；那么梦想呢。理想是人生道路上的行驶的动力，为你补满前进的信心，那么梦想呢。虽说梦想跟理想差不多，但是，梦想跟理想确实是不一样的。让我来告诉你们为什么，因为梦想有种不能实现的感觉，妄想不切实际。而理想是具有合理性根据性。

人人都知道爱因斯坦的童年多灾多难，读书时曾经历了多次挫折与失败。他从小被认为智力迟钝、与反应缓慢的反应、老师都说他一事无成，但因为他有一个梦想，有一个不切实际的梦想，他想当一名发明家，他面对各种困难不退缩，到最后成为一名伟大的发明家。因为他有梦想，他把别人的话不放在心上，到最后借助梦想的力量战胜了心魔。实现了自己的梦想。梦想是美丽的，它比现实美好，它比幻想现实。有了星星，让天空更加明亮；有了鱼儿，让大海更加欢畅；有了梦想，生命才会更加辉煌。随着年龄的增长，我也有了自己的梦想，如果一个人没有了梦想，那他的人生注定是要失败的。梦想就如同人生目标，没有了梦想就相当于没有了人生目标。即使自己的梦想不切实际，但是它能激发你生命的热情和力量，我相信你一定会打破现实，成功的去实现自己的梦想。雨果曾经说过没有理想的人生是不幸的人生。一个人活在世上，如果没有理想，没有为理想而奋斗，那么他的人生是不完美的。因为他没有目标，没有追求。

落红不是无情物，化作春泥更护花。选择坚持，选择珍惜，选择成就生命的激情，勇敢的成就心中最初的梦想。

As we know, water is very important to man, we can’t live without water.

The amount of water which is suitable to drink is less and less. But some people

don’t care about it. They waste a lot of water in their daily life. Even worse,

they pour dirty water into rivers. They throw rubbish into rivers, too. Many

rivers and lakes are seriously polluted. Something must be done to stop the

pollution. And I think it’s agreat shame to waste while millions are in great

need of water. I think what we can do is that we have to save every drop of

water as possible as we can. For example, we must turn off the tap immediately

after we use it. We can use a basin to wash our hands and faces. It’s also a

good idea to encourage my friends and family members to join me! Only in this

way can we live happily. If we don’t save water, the last drop of water will be

a tear-drop of us. I believe if everyone makes a little effort, we can make a

big difference.

According to the report that most children in the family don’t have to the housework, because their parents have done all the work for them. When students go to middle school, it means they are not the little girls and little boys anymore, they have grown up and it is time for them to learn to be independent. Doing the housework and reducing the parents’ burden help the children to be mature, what’s more, the parents should not overprotect their kids all the time, they can give some jobs to the children and lead them to be independent. Doing the housework is not a big deal, but it is the attitude to life.

据报道,大多数孩子在家里不用做家务,因为他们的父母为他们做了所有的工作。当学生进入中学,这意味着他们不是小女孩和小男孩,他们已经长大了,是时候让他们学会独立。做家务和减少父母的负担帮助孩子成熟,更重要的是,父母不应该过度保护他们的孩子,他们可以给孩子们一些工作,让他们独立。做家务不是一个大问题,但它是一种对生活的态度。

The Palace Museum is also called the Forbidden City, whichstarted to be built in 1407. It took 200,000 people fourteenyears to build it.

It was finished in 1420. There are 9,999 rooms in all the palaces. In China, nine is regarded as a lucky number traditionally. At present, it is free for Chinesestudents to visit every Tuesday.

The Palace Museum has treasures of over 5,000 years history.

Today, people count on the high-tech products so much, we can see no matter

where we are, we could find people low down their hands, playing their

cellphones. About two years ago, it is very popular that people shopping online,

now as the function of cellphone has been highly developed, people can use their

cellphone to shop online. As shopping online is so convenient, more and more

people like to buy things online, especially the men, because they don’t like to

go out, now the Internet can help them shop in a quick way. The things online

are various, people can search what they want and compare with the price, they

can buy the products they want. Shopping online is the new way for people to

purchase, in the future, it will be more and more popular. The Internet provides

people’s life.

On the thirty, is the new years day, everywhere permeated with a festive atmosphere. Everybody happily sit together to eat dinner, I love to eat fish balls on the table, my sister and brother Sweet and Sour Spare Ribs favorite, favorite braised fish in soy sauce. After the dinner, my brother and sister began to set off firecrackers and fireworks. At this time, I brought a carefully lit fireworks, fireworks, and for a while a green spray, spray red, while spraying purple, is really fun.

My sister brought the firecrackers, the "popping" and "shout shout" sound like thunder, scared us everywhere escape. Brother of fireworks and crackers, is even more magical, while fly to the sky, while flying on the roof of the night dressed as the day, we see dazzling.

Just as we are playing vigorously, "when Dangdang, Dangdang", the bell of zero hour is ringing, the new year begins. Lets all wish the happy new year and the happy family together.

“人都有梦，有梦就别怕痛……”听着这首喜欢的歌，我也在思考我的梦想。

小时候，我曾幻想过很多。我幻想过当一名舞蹈演员，因为我觉得电视上那些舞蹈演员看起来很优美很漂亮；我幻想过当一名老师，因为我想让我的学生作业少一点；我幻想过当一名画家，我觉得我的斌斌哥哥画画很好看，我也想像他一样……可后来啊，心里那些梦想随着长大逐渐地消失，心里也在不断萌发新的梦想。我也对梦想有了一个新的概念，梦想不应该只是像小时候那样凭空想像，而是还要有实现它的决心和不断的追求。

终于，随着年龄的增长，我的梦想似乎坚定了。我想成为一名作家。这个梦想是由于我经常看杨红樱阿姨的书而萌发的念头，她的文字好像心灵鸡汤一样，看似简单平凡的故事让人看完觉得很温暖。用杨红樱阿姨的话来说就是”语言不一定要华丽优美，真实就好；孩子们成绩不一定更多优秀，善良快乐就好”。我想成为作家，我希望通过文字来记叙我的故事，通过文字来向世界表达我的情感，让我的文字去温暖一颗颗心。

梦想不一定要让别人觉得很远大。只要自己热爱，努力去追求，才足以称之为梦想。有梦想是一件非常美好的事情，有了梦想好像才可以知道下一步该怎样去走，在为梦想努力的过程中更是非常美好非常幸福的过程。

引用一句马云的话：“梦想还是要有的，万一实现了呢”。

[初中作文心中有梦想