爱伦坡sonnet to science的PPT

合集下载

埃德加爱伦坡ppt课件

埃德加爱伦坡ppt课件
岁,死因不明,各类说法甚多。
;.
2
作家信息
外文名 Edgar Allan
Poe
国籍
美国
出生日期 1809年1月19日
星座
摩羯座
毕业院校 弗吉尼亚大学
主要成就 侦探小说、恐怖小说、
效果论
;.
3
故事Байду номын сангаас介
故事发生在南卡罗来纳州的苏里文岛, 主人公威廉·勒格朗,他在不久前被一 只金色的虫子咬了,他的仆人丘比特害 怕他会发疯,于是去找到了勒格朗的朋友, 一位不知名的叙述者,勒格朗在破解了 一份关于被埋葬的宝藏的秘密文件之后, 带着两人一起去冒险寻宝。
;.
4
密文内容


一面好镜子在皮肖甫客店魔椅四十一度十三分东北偏北最大树杈第七根枝桠东南
从骷髅头左眼射击从树前引一直距线通过子弹延伸五十英尺
5
;.
6
埃德加··坡 侦探小说之父
;.
1
作家简介
埃德加·爱伦·坡(Edgar Allan Poe)(1809~1849),美国作家、诗人、编者与文学评论 家,被尊崇是美国浪漫主义运动要角之一,以悬疑、惊悚小说最负盛名。爱伦·坡是美国 的短篇小说家先锋之一,并被公认是推理小说的创造者,甚至被视为科幻小说的共同催生 者之一。他的短篇小说大致分为三类:恐怖故事、谋杀疑案和科学难解之谜。他开创了侦 探小说的先河,被称为“侦探小说之父”。1849年10月7日,爱伦·坡逝于巴尔的摩,四十

高一英美文学爱伦坡乌鸦EdgarAllenoeandheRavenPPT课件

高一英美文学爱伦坡乌鸦EdgarAllenoeandheRavenPPT课件
4
Introduction
a miserable childhood
was adopted
entered the University
by John Allan
but didn’t finish
went to West Point but
an unhappy
was dismissed
relationship
Ratiocination(推理)
“The Murders in the Rue Morgue” 《莫格街谋杀案》
“The Gold Bug”《金甲虫》
“The Purloined Letter”《被窃的信
件“》The Mystery of Marie Roget” 《玛丽罗杰谜
案》
10
works
at 27 he married his 13-year-old cousin
her death in 1847 left him a bitterer life
died in mysterious circumstance s, in 1849
5
Introduction
a villain with no virtue
Cps. yfacthhoearnoaflfdyatetitcheecrtiovfe
western stories;
criticism;
3
Important Points
• 1. Poe’s major works. • 2. Poe’s literary characteristics
and achievements
Literary theory
The Philosophy of Composition 《创作原理》 The Poetic Principle 《诗歌原则》

Sonnet课件

Sonnet课件

Sonnet
• The sonnet form first became popular during the Italian Renaissance, when the poet Petrarch published a sequence of love sonnets addressed to an idealized woman named Laura. Taking firm hold among Italian poets, the sonnet spread throughout Europe to England, where, after its initial Renaissance, "Petrarchan" incarnation faded, the form enjoyed a number of revivals and periods of renewed interest.
Shakespeare
Copernicus
Bacon
Galilei
Dante
Vinciຫໍສະໝຸດ Renaissance• "Renaissance" literally means "rebirth." It refers especially to the rebirth of learning that began in Italy in the fourteenth century, spread to the north, including England, by the sixteenth century, and ended in the north in the mid-seventeenth century (earlier in Italy). During this period, there was an enormous renewal of interest in and study of classical antiquity.

大学 美国文学之爱伦坡ppt课件

大学 美国文学之爱伦坡ppt课件
11
维琴妮亚用温柔与爱启示爱伦坡写成了很多最优美的诗句, 其中就有那篇不朽的名年的时间,可是仅卖了十块钱。这 件事立刻在当地传为最大的笑话,爱伦坡成为了公认的弱智 与无能之辈。许多人都为自己能够识别出一个白痴而骄傲, 感觉自己与相中良马的伯乐一样出色(但是他们犯了最大的 错误,今天这首诗的原稿已售价数万美元)。
Beauty is truth and leads to spiritual oneness and artistic integrity
8
The Raven
爱伦·坡的长诗《乌鸦》发表于1845年。诗作发表之后引起轰 动,有出版商请著名的插画家Gustave Doré为这首长诗创作了 25幅插画。
19
很快我的心变得坚强;不再犹疑,不再彷徨, “先生,”我说,“或夫人,我求你多多包涵; 刚才我正睡意昏昏,而你来敲门又那么轻, 你来敲门又那么轻,轻轻叩击我的房门, 我差点以为没听见你”——说着我拉开门扇;—— 唯有黑夜,别无他般。
20
凝视着夜色幽幽,我站在门边惊惧良久, 疑惑中似乎梦见从前没人敢梦见的梦幻; 可那未被打破的寂静,没显示任何迹象。 “丽诺尔?”便是我嗫嚅念叨的唯一字眼, 我念叨“丽诺尔!”,回声把这名字轻轻送还, 唯此而已,别无他般。
体弱的维琴妮亚终究敌不过饥寒交迫,在一个寒冷的冬夜, 带着令人感动的爱去了。失去了爱妻,爱伦坡几乎崩溃了, 惟一支撑他的只有成功的信念了。在爱妻的坟墓旁,他强 忍着泪水和思念,拿着笔,一刻也不放下,他用尽一切气 力,投身于创作。从白天到夜晚,从夜晚到梦中,从梦中 又到白天……终于,使他写出了感人肺腑的《爱的称颂》。 爱伦坡终于迎来了成功。
4. The creation of work of art requires the utmost concentration and unity, as well as the most scrupulous use of words.

英国文学 讲解Sonnet PPT课件

英国文学 讲解Sonnet PPT课件
在此诗的基本音步类型是抑扬格,每行五音步。因此 称此诗的格律是“抑扬格五音步”(iambic pentameter)。一首诗的音步类型和诗行所含的音步 数目构成此诗的格律(meter)。
第9页/共53页
Hamlet
Old words:
• Thee, obj.,
thou, sub.,
thy=your, thine=yours, or
第11页/共53页
Hamlet
Old words:
• Ere=before still=always oft=often Happily=haply=perhaps even=evening
第12页/共53页
6. Text Study: Sonnet 18
可否把你比作美丽的夏天? 可你比夏天更加可爱如绣: 狂风摇曳着五月里的花冠, Shall I compare thee to a summer ’s d夏ay天? 的租期不肯太长逗留,
有时候苍之巨眼未免焦灼, 他金色的脸也会经常暗退。 所有的美丽总会不免衰落, 偶然或永恒总将美丽残催。
第14页/共53页
But thy eternal summer shall not fade,
But your youth shall not fade, Nor lose possessioNnoorf wthiallt yfaoiur tlohoseu tohwe’bseta; uty that you possess; Nor shall Death brNagorthwoiullwdaenadtherc’lastimin yhoisu sfhoardhei,s own, When in eternal linBeesctaoustiemien tmhoyuegterornwa’l svte; rse you will live forever.

最新Sonnet-18PPT课件

最新Sonnet-18PPT课件
合伙人不得自营或者同他人合作经营与本合伙企业相竞争的业务。 除合伙协议另有约定或者经全体合伙人一致同意外,合伙人不得同本合
伙企业进行交易。
5.3.6 例 题1-2
【例题1】根据《合伙企业法》的规定,普通合伙企业的下列事务中,可以不经全体合伙人
A.以合伙企业的名义为他人提供担保 B.合伙人之间转让在合伙企业中的部分财产份额 C.聘任合伙企业以外的人担任合伙企业的管理人员 D.改变合伙企业的名称 【例题2】根据《合伙企业法》的规定,普通合伙企业存续期间,必须经全体合伙人一致同
9
Thank you
第五章 合伙企业法律制度
5.1 企业的性质
定义:是指依法成立,以营利为目的,相对持续、稳定地从 事一定经济活动并享受权利、承担义务的社会组织。
企业的四个基本属性! 分类:1)依据法律地位:法人企业和非法人企业。2)依据
所有权性质:国有企业、集体企业和私营企业。3)依据财 产责任:个人独资企业、合伙企业和公司。4)依据是否涉 外因素:涉外企业和非涉外企业。5)依据生产经营规模: 大型企业、中型企业和小型企业。6)依据主营业务性质: 工业企业、商业企业、交通运输企业和金融企业等。
◆ The beauty of friend more lovely and more temperate
8
Connotation
◆ Time how can his friend have eternal fair?
◆ poem Live as long as this poem give life to thee
除外。
5.3.4 合伙企业的出资方式
合伙人可以用货币、实物、知识产权、土地使用权或者其 他财产权利出资,也可以用劳务出资(有限合伙人除外)。

爱伦坡英文介绍PPT

爱伦坡英文介绍PPT

Allan Poe was the first well-known American writer to try to earn a living through writing alone, resulting in a financially difficult life and career. He was orphaned young and was taken in by John and Frances Allan, but they never formally adopted him. He attended the University of Virginia for one semester but left due to lack of money. His publishing career began humbly, with an anonymous collection of poems, Tamerlane and Other Poems (1827), credited only to "a Bostonian".
Edgar Allan Poe was an American author, poet, editor and literary critic, considered part of the American Romantic Movement. Best known for his tales of mystery and the macabre, Poe was one of the earliest American practitioners of the short story and is considered the inventor of the detective fiction genre. He is further credited with contributing to the emerging genre of science fiction.

美国文学史之AllanPoe课件

美国文学史之AllanPoe课件
Life Experiences
1809: born in Boston 1826: university of Virginia 1827: his first book of poetry, Tamerlane and
Other Poems 1830: West Point 1832 : his first short story “MS. Found in a Bottle” 1835: editor of The Southern Literary Messenger 1836: married 1847: his wife died 1849: died in Baltimore
To shut her up in a sepulcher In this kingdom by the sea…
Poe’s Theories for the Short Stories
Reviews of Hawthorne’s Twice-Told Tales Totality: “ in almost all classes of
Annabel Lee
It was many and many a year ago, In a kingdom by the sea,
That a maiden there lived whom you may know By the name of Annabel Lee; —
And this maiden she lived with no other thought Than to love and be loved by me.
Heart”, “Ligeia”, “The Masque of the Red Death”, etc.

爱伦坡ppt课件

爱伦坡ppt课件
•《过早的埋葬》(The Premature Burial)
•《陷阱与钟摆》(The Pit and the Pendulum)
6

《艾尔·阿拉夫》(Al Aaraaf)
《安娜贝尔·李》(Annabel Lee)
《钟声》(The Bells)
《海中之城》(The City in the Sea)
《The Conqueror Worm》
3
• Education: finished his elementary education in London, studied in the University of Virginia for one year. Then he dropped out because of excessive drinking.
2
• Birth:1809.1.19, born in Boston • Family: his mother is a charming and
talented actress, while his father is ordinary and incapable. They both died when he was about three years old. Then he was adopted by the Allens .
• The atmosphere of the work is doom
and gloom, the rhetoric is beautiful
and full of pretty rhyme. Sometic.
10
• Critics put him in the romantic period, gothic period, dispirited period, and symbolic period.

edgar allan poe 爱伦坡简介 ppt课件.ppt

edgar allan poe 爱伦坡简介 ppt课件.ppt
service of artistic effect
Page 16
Themes in Poe’s works
Death—predominant theme in Poe’s writing “Poe is not interested in anything alive. Everything in Poe’s writings is dead.”
Edgar Allan Poe 爱伦·坡
(1809—1849)
杜亚芳
A poet, short story writer, and literary critic
Page 2
Poe’s mother
Page 3
Edgar Allan Poe(1809—
1849)埃德加.爱伦.坡
Part I. Life Experience Part II. Major Works Part III.Literary Position Part IV.Appreciation Part ments on Poe
Horror;Hidden evil: Unspeakable, mysterious crimes, including incest and parricide
Maniacal Laughter(crazy) The discovered manuscript
gives responsibility to someone else Deformity(畸形)
【希腊神话】林木女神
月亮女神
【希腊、罗马神话】 那伊阿得(掌管河、泉 的水泽女神)
Page 18
Part ments on Poe
Emerson dismissed him in three words “the jingle man” (打油诗人),Mark Twain declared his prose to be unreadable. And Whitman was the only famous literary figure present at the Poe Memorial Ceremony in 1875.

爱伦坡-ppt

爱伦坡-ppt

2021/6/7
7
Detective Story
a Thou Art the Man(你就是凶手)
b The P urloined Letter(被窃之信)
c The Mystery of Marie Roget(玛丽·罗杰 疑案)
d The Murders in the Rue Morgue(莫格 街谋杀案 )
b The Fall of the House of Usher(厄舍古厦的 倒塌)
c The Angel of the Odd(奇怪天使) d The Devil in the Belfry(钟楼魔影) e The Oval Portrait (椭圆形画像) f The Man That Was Used Up(被用光的人) g King Pest (瘟疫王)
爱妻辞世,心伤难愈,晚年孤寂。
病魔缠身,饮恨西归,死因不明。
2021/6/7
5
II Main Works
❖ Gothic(歌特)story
❖ Detective story
❖ Poetry
2021/6/7
6
Gothic Story
a The Masque of the Red Death (红死病的假 面舞会)
2021/6/7
9
The Raven (乌鸦)
It tells of a talking raven's mysterious visit to a distraught lover. The lover, often identified as being a student,12 ,is lamenting the loss of his love, Lenore. The raven seems to further instigate his distress with its constant repetition of the word "Nevermore". The poem makes use of a number of folk and classical references.

美国文学爱伦坡,安娜贝尔李PPT课件

美国文学爱伦坡,安娜贝尔李PPT课件
An unhappy youth: at 17 went to the University of Virginia but did not finish, an appointment to West Point but was dismissed less than a year later.
.
13
It was many and many a year ago,
很久很久以前,
In a kingdom by the sea, 在一个滨海的国度里,
That a maiden there lived 住着一位少女你或许认得,
whom you may know
她的芳名叫安娜贝尔.李;
By the name of ANNABEL
就这样,伴着潮水,我整夜躺在 她身旁 我亲爱的——我亲爱的——我的 生命,我的新娘, 在海边那座坟茔里, 在大海边她的墓穴里。
In her tomb by the side of the
sea.
.
16
The analysis of Annabel Lee
Edgar Allan Poe 's Annabel Lee describes a sad love story between a maiden and the narrator. With no more than 300 words, the poet reveals his thought of some immortal topics of human beings, such as love, life and death, demon and angel.
.
11
Annabel Lee
.
12

《Sonnet18赏析》PPT课件

《Sonnet18赏析》PPT课件

4 And summer's lease hath all too short a date. b
5 Sometime too hot the eye of heaven shines, c
6 And often is his gold complexion dimm'd;
d
7 And every fair from fair sometime declines, c
梁树清
.
1
1 Shall I /compare /thee to/ a sum/mer's day? a 2 Thou art/ more love/ly and /more tem/perate. b
3 Rough winds do shake the darling buds of May,a
.
4
感谢亲观看此幻灯片,此课件部分内容来源于网络, 如有侵权请及时联系我们删除,谢谢配合!
Alliteration: “And” “And”, “By” “But”, “So” “So” Simile: “Shall I compare thee to a summer's day?” Metaphor: “And summer's lease hath all too short a date.” Personification: “Sometime too hot the eye of heaven shines” Hyperbole: “But thy eternal summer shall not fade”
12 When in eternal lines to time thou grow'st.
f

Sonnet to Science文档

Sonnet to Science文档

Summary:Poe asks why science preys on the poet. Science is peering, destructive and interested only in cold realities. It will not allow the poet to soar in fantasy or even to sit peacefully dreaming beneath a tree .Analysis:"Sonnet - To Science" is a poet's lament over the dangers of scientific development and its negative implications for poetry and creativity. Poe lived and wrote in the early nineteenth century as the European Industrial Revolution was crossing the Atlantic and transforming the technological landscape of the eastern United States, and his poem reflects an artistic backlash to the potential problems of the emerging America. Poe's concerns have been relevant at every stage of scientific progress, from the Renaissance to the current day, as each series of technological changes awakens the eternal fear that man will destroy his own humanity during his excited search for better machinery.In particular, "Sonnet - To Science" hints at the tension between the forward-looking advances of the Industrial Revolution and the nature-oriented tendencies of the Romantic era. Romanticism had appeared as a counterargument to the Enlightenment philosophy of embracing and celebrating progress. Members of this movement sought to return to a purer, more innocent state of nature because they felt that society had corrupted man's innate goodness. Poe was a member of the American Romantic movement, and the poet of Poe's sonnet accordingly explores the inevitable clash between the Romantic outlook on life and the comparative thoughtlessness of industrialism.The poet of Poe's sonnet worries about and rejects scientific dogmatism because he regards it as too unimaginative and stagnating. For him, science is a predator or, like a vulture, a carrion-eater, and it has damagingly crippled his imagination with "dull realities." In his apostrophe to science, he alludes to characters from Greek and Roman mythology, such as the Hamadryad and Naiad nymphs and Diana, the Roman goddess of the hunt, describing their forced banishment as evidence that humanity is too willing to discard its creative soul. To reinforce the value of the past over the value of the thoughtless future, Poe uses a traditional English sonnet form to arrangehis thoughts. A sonnet consists of fourteen lines, which in the Shakespearean form can be divided into three heroic quatrains and one heroic couplet, where the overall rhyme scheme is ABAB CDCD EFEF GG. The lines are heroic because they use iambic pentameter, or a series of five iambs, where each iamb is an unstressed followed by a stressed syllable. The sonnet form has existed for centuries, and when combined with the archaic diction, the narrator tries to show the beauty of old forms as a structural contrast to the ugliness of scientific realities.Despite the apparent message of the sonnet, some details of "To Science" could serve to undermine the poet's words. He ironically personifies science in the first line, which may suggest that he unconsciously recognizes some humanity even in what he perceives as the stultifying influence of science. On the other hand, his personification may highlight his fundamental incompatibility with science, since he cannot help but poeticize the mundane. In addition, the use of a rigid sonnet form may also indicate that poetry is itself not as free-formed as the poet characterizes it to be, or alternatively it may suggest that some constraints do not necessarily indicate the strangulation of the imagination.。

爱伦·坡恐怖小说 读书推荐PPT

爱伦·坡恐怖小说 读书推荐PPT

谢谢!
爱伦· 坡恐怖小说集
关于作者



爱伦·坡是19世纪美国著名小说家、诗人、文艺评论家,是世界 文学史上第一位自觉地把短篇小说视为一种独立的文学体裁的作 家。 提倡“ 为艺术而艺术”,宣扬唯美主义和神秘主义。他的作品 中丰富的想象、不寻常的内容、新奇的手法以及细致入微的心理、 意识的刻画,对现代西方文学和电影的发展产生了重大影响。 因其小说风格怪异离奇、充满恐怖气氛,故有“侦探小说的鼻祖” 和“恐怖小说之父”之美称。英国柯南道尔的《福尔摩斯探案 集》、法国凡尔纳的科幻小说,以及今天广为流传的种种推理、 罪案小说,都深受他的作品影响。
读后感受

印象最深的便是《黑猫》和《蒙提亚特酒》的 这两篇。故事里总流露出一种奇异诡谲的气氛, 尤其是《黑猫》,像是要扼住人的咽喉般,有 点压抑,又带着点邪恶的美。我想这大概就是 恐怖的美学所在。毫无疑问,爱伦坡是个能掌 握全局的大师,他以他那只神奇的笔,为我们 描绘出了一个个奇幻诡异的故事,我们不敢往 下看,却又带着强烈的想要阅读的欲望,读后 心里总会升腾起一股奇特的感觉„„
社会评价



拜读这些小说,紧张、神秘的恐怖气氛萦绕心头,挥 之不去。 现代审丑意识的出现,是人们美学观念的巨大进步。 它使人在人格上更加独立,在精神上更加自由。丑和 恶正是坡恐怖小说中的一大景观,可以说较早地突破 了审美传统,转到审丑、审恶的创新上。 坡所倡导的美已非传统意义上的美,而是与死亡结合 的哀伤、忧郁的美。坡审丑的意义,一方面是收到恐 怖的预期效果;另一方面则是让读者在品味丑恶的同时 得到一种发泄,享受一种刺激的快感。 坡的恐怖小说体现了现代人的审美趣味。
意象


在恐怖小说中,坡营造了一个个独特而意义深邃的意 象。 《黑猫》中的黑猫是一个突出的恶的意象。黑猫因总 是与巫婆相伴,而被视为不吉利的象征。 《泄密的心》中的老人和《黑猫》中的两只黑猫都是 一只眼睛,这种独眼给人以极其邪恶的感觉,被赋予 了不可解释的疾病和不幸。 上述意象的出现大大丰富了坡恐怖小说本身的含义。 坡为20世纪以象征为主要艺术特色的现代派文学
  1. 1、下载文档前请自行甄别文档内容的完整性,平台不提供额外的编辑、内容补充、找答案等附加服务。
  2. 2、"仅部分预览"的文档,不可在线预览部分如存在完整性等问题,可反馈申请退款(可完整预览的文档不适用该条件!)。
  3. 3、如文档侵犯您的权益,请联系客服反馈,我们会尽快为您处理(人工客服工作时间:9:00-18:30)。

Structure
The third quatrain, accuses Science of spoiling some beautiful myths, such as that of Diana and the Hamadryad. Finally, the concluding couplet reveals the reason for the persona’s lament; here, with the poem’s only first-person pronoun, the persona focuses attention on himself, accusing Science of depriving him of his reverie.
Sonnet: To Science
By Edgar Allan Poe
A Presentation by Neeta Dixit (Roll No. 06D02016)e (1809 – 1849) was an American poet, short-story writer, editor and literary critic, and is considered part of the American Romantic Movement. • Romanticism is a complex artistic, literary, and intellectual movement that originated in the second half of the 18th century in Western Europe, and gained strength during the Industrial Revolution. It was partly a revolt against aristocratic social and political norms of the Age of Enlightenment and a reaction against the scientific rationalization of nature, and was embodied most strongly in the visual arts, music, and literature.
He calls science, a true daughter of Old Time who changes all things by looking at them with peering eyes and inflicts emotional damage upon the vulnerable poet and a vulture, focused on dull reality. Here Poe compares science to a “true daughter of Old Time” and a “Vulture.” Both comparisons help make a case against science and cast it in a negative light. The reference to time reminds the reader of death and decay, both of which come with time. Without time, after all, there would be no reason to worry about deadlines and responsibilities, and one could devote oneself completely to reverie. The reference to a vulture, similarly, conjures up the connotations of death and decay while completing the image in the previous line of science devouring the heart of the poet.
Importance of the work
First published in 1829,it was written while Poe was in the Army. This is considered the best of his early poems written in the Army. It is symbolic of an important transformation in Poe's style and attitude. It's sonnet form shows Poe's poetic maturity and discipline. The subject matter reveals that Poe was entering the world of science, which he would later master. Before, his education and attention had been in classics and history.
Theme
He implores Science as to why “she” must impose her “dull realities” on the hearts of poets like himself, squelching their wandering minds. He questions the desertion of imagination by the objective force of science. He is inclined to avoid logic in his argument, although the classic sonnet structure implies his own attempt to rationalize his own thoughts. Perhaps the structure contrasted with such feelings further insinuates humanity's paradoxical need for organization in every field of thought.
Sonnet: To Science
Science! true daughter of Old Time thou art! Who alterest all things with thy peering eyes. Why preyest thou thus upon the poet's heart, Vulture, whose wings are dull realities? How should he love thee? or how deem thee wise? Who wouldst not leave him in his wandering To seek for treasure in the jewelled skies, Albeit he soared with an undaunted wing? Hast thou not dragged Diana from her car? And driven the Hamadryad from the wood To seek a shelter in some happier star? Hast thou not torn the Naiad from her flood, The Elfin from the green grass, and from me The summer dream beneath the tamarind tree?
• Poet = "he" of "How should he love thee?"
• “Science! true daughter of Old Time thou art! Who alterest all things with thy peering eyes. Why preyest thou thus upon the poet's heart, Vulture, whose wings are dull realities? “
Meanings and References
• Science = daughter of Old Time = vulture = the "thee" of "How should he love thee?" = the "who" of "Who wouldst not leave him in his wandering".
Structure
Sonnet: The term "sonnet" derives from the Provencal word "sonet" and the Italian word "sonetto," both meaning "little song". A sonnet now is a poem of fourteen lines that follows a strict rhyme scheme and specific structure. The conventions associated with the sonnet have however evolved over its history. Following the tradition of the English sonnet, this poem contains three quatrains and a concluding couplet. The first quatrain,condemns Science as a “true daughter of Old Time” and as a “Vulture” that “preyest . . . upon the poet’s heart” The second quatrain, poses rhetorical questions asking how a poet could like, respect, or join Science .
相关文档
最新文档