A Brief History of Time 时间简史
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CHAPTER 10 WORMHOLES AND TIME TRAVEL

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The last chapter discussed why we see time go forward:
why disorder1 increases and why we remember the past butnot the future. Time was treated as if it were a straight railwayline on which one could only go one way or the other.
But what if the railway line had loops and branches so thata train could keep going forward but come back to a station ithad already passed? In other words, might it be possible forsomeone to travel into the future or the past?
H. G. Wells in The Time Machine explored these possibilitiesas have countless2 other writers of science fiction. Yet many ofthe ideas of science fiction, like submarines and travel to themoon, have become matters of science fact. So what are theprospects for time travel?
The first indication that the laws of physics might really allowpeople to travel in time came in 1949 when Kurt Godeldiscovered a new space-time allowed by general relativity. Godelwas a mathematician3 who was famous for proving that it isimpossible to prove all true statements, even if you limityourself to trying to prove all the true statements in a subjectas apparently4 cut and dried as arithmetic. Like the uncertaintyprinciple, Godel’s incompleteness theorem may be a fundamentallimitation on our ability to understand and predict the universe,but so far at least it hasn’t seemed to be an obstacle in oursearch for a complete unified6 theory.
Godel got to know about general relativity when he andEinstein spent their later years at the Institute for AdvancedStudy in Princeton. His space-time had the curious propertythat the whole universe was rotating. One might ask: “Rotatingwith respect to what?” The answer is that distant matter wouldbe rotating with respect to directions that little tops orgyroscopes point in.
This had the side effect that it would be possible forsomeone to go off in a rocket ship and return to earth beforehe set out. This property really upset Einstein, who hadthought that general relativity wouldn’t allow time travel.
However, given Einstein’s record of ill-founded opposition7 togravitational
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1 disorder Et1x4     
n.紊乱，混乱；骚动，骚乱；疾病，失调
参考例句：
  • When returning back,he discovered the room to be in disorder.回家后，他发现屋子里乱七八糟。
  • It contained a vast number of letters in great disorder.里面七零八落地装着许多信件。
2 countless 7vqz9L     
adj.无数的，多得不计其数的
参考例句：
  • In the war countless innocent people lost their lives.在这场战争中无数无辜的人丧失了性命。
  • I've told you countless times.我已经告诉你无数遍了。
3 mathematician aoPz2p     
n.数学家
参考例句：
  • The man with his back to the camera is a mathematician.背对着照相机的人是位数学家。
  • The mathematician analyzed his figures again.这位数学家再次分析研究了他的这些数字。
4 apparently tMmyQ     
adv.显然地；表面上，似乎
参考例句：
  • An apparently blind alley leads suddenly into an open space.山穷水尽，豁然开朗。
  • He was apparently much surprised at the news.他对那个消息显然感到十分惊异。
5 uncertainty NlFwK     
n.易变，靠不住，不确知，不确定的事物
参考例句：
  • Her comments will add to the uncertainty of the situation.她的批评将会使局势更加不稳定。
  • After six weeks of uncertainty,the strain was beginning to take its toll.6个星期的忐忑不安后，压力开始产生影响了。
6 unified 40b03ccf3c2da88cc503272d1de3441c     
(unify 的过去式和过去分词)； 统一的； 统一标准的； 一元化的
参考例句：
  • The teacher unified the answer of her pupil with hers. 老师核对了学生的答案。
  • The First Emperor of Qin unified China in 221 B.C. 秦始皇于公元前221年统一中国。
7 opposition eIUxU     
n.反对，敌对
参考例句：
  • The party leader is facing opposition in his own backyard.该党领袖在自己的党內遇到了反对。
  • The police tried to break down the prisoner's opposition.警察设法制住了那个囚犯的反抗。
8 collapse aWvyE     
vi.累倒；昏倒；倒塌；塌陷
参考例句：
  • The country's economy is on the verge of collapse.国家的经济已到了崩溃的边缘。
  • The engineer made a complete diagnosis of the bridge's collapse.工程师对桥的倒塌做了一次彻底的调查分析。
9 strings nh0zBe     
n.弦
参考例句：
  • He sat on the bed,idly plucking the strings of his guitar.他坐在床上，随意地拨着吉他的弦。
  • She swept her fingers over the strings of the harp.她用手指划过竖琴的琴弦。
10 warp KgBwx     
vt.弄歪，使翘曲，使不正常，歪曲，使有偏见
参考例句：
  • The damp wood began to warp.这块潮湿的木材有些翘曲了。
  • A steel girder may warp in a fire.钢梁遇火会变弯。
11 warped f1a38e3bf30c41ab80f0dce53b0da015     
adj.反常的；乖戾的；（变）弯曲的；变形的v.弄弯，变歪( warp的过去式和过去分词 )；使（行为等）不合情理，使乖戾，
参考例句：
  • a warped sense of humour 畸形的幽默感
  • The board has warped. 木板翘了。 来自《现代汉英综合大词典》
12 sufficiently 0htzMB     
adv.足够地，充分地
参考例句：
  • It turned out he had not insured the house sufficiently.原来他没有给房屋投足保险。
  • The new policy was sufficiently elastic to accommodate both views.新政策充分灵活地适用两种观点。
13 galaxy OhoxB     
n.星系；银河系；一群(杰出或著名的人物)
参考例句：
  • The earth is one of the planets in the Galaxy.地球是银河系中的星球之一。
  • The company has a galaxy of talent.该公司拥有一批优秀的人才。
14 consolation WpbzC     
n.安慰，慰问
参考例句：
  • The children were a great consolation to me at that time.那时孩子们成了我的莫大安慰。
  • This news was of little consolation to us.这个消息对我们来说没有什么安慰。
15 paradox pAxys     
n.似乎矛盾却正确的说法；自相矛盾的人(物)
参考例句：
  • The story contains many levels of paradox.这个故事存在多重悖论。
  • The paradox is that Japan does need serious education reform.矛盾的地方是日本确实需要教育改革。
16 vice NU0zQ     
n.坏事；恶习；[pl.]台钳，老虎钳；adj.副的
参考例句：
  • He guarded himself against vice.他避免染上坏习惯。
  • They are sunk in the depth of vice.他们堕入了罪恶的深渊。
17 density rOdzZ     
n.密集，密度，浓度
参考例句：
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
18 overdrawn 4eb10eff40c3bcd30842eb8b379808ff     
透支( overdraw的过去分词 )； (overdraw的过去分词)
参考例句：
  • The characters in this novel are rather overdrawn. 这本小说中的人物描写得有些夸张。
  • His account of the bank robbery is somewhat overdrawn. 他对银行抢案的叙述有些夸张。
19 densities eca5c1ea104bef3058e858fe084fb6d0     
密集( density的名词复数 )； 稠密； 密度（固体、液体或气体单位体积的质量）； 密度（磁盘存贮数据的可用空间）
参考例句：
  • The range of densities of interest is about 3.5. 有用的密度范围为3．5左右。
  • Densities presumably can be probed by radar. 利用雷达也许还能探测出气体的密度。
20 annihilate Peryn     
v.使无效；毁灭；取消
参考例句：
  • Archer crumpled up the yellow sheet as if the gesture could annihilate the news it contained.阿切尔把这张黄纸揉皱，好象用这个动作就会抹掉里面的消息似的。
  • We should bear in mind that we have to annihilate the enemy.我们要把歼敌的重任时刻记在心上。
21 wavelength 8gHwn     
n.波长
参考例句：
  • The authorities were unable to jam this wavelength.当局无法干扰这一波长。
  • Radio One has broadcast on this wavelength for years.广播1台已经用这个波长广播多年了。
22 wavelengths 55c7c1db2849f4af018e7824d42c3ff2     
n.波长( wavelength的名词复数 )；具有相同的/不同的思路；合拍；不合拍
参考例句：
  • I find him difficult to talk to—we're on completely different wavelengths. 我没法和他谈话，因为我们俩完全不对路。 来自《简明英汉词典》
  • Sunlight consists of different wavelengths of radiation. 阳光由几种不同波长的射线组成。 来自辞典例句
23 crest raqyA     
n.顶点；饰章；羽冠；vt.达到顶点；vi.形成浪尖
参考例句：
  • The rooster bristled his crest.公鸡竖起了鸡冠。
  • He reached the crest of the hill before dawn.他于黎明前到达山顶。
24 crests 9ef5f38e01ed60489f228ef56d77c5c8     
v.到达山顶（或浪峰）( crest的第三人称单数 )；到达洪峰，达到顶点
参考例句：
  • The surfers were riding in towards the beach on the crests of the waves. 冲浪者们顺着浪头冲向岸边。 来自《简明英汉词典》
  • The correspondent aroused, heard the crash of the toppled crests. 记者醒了，他听见了浪头倒塌下来的轰隆轰隆声。 来自辞典例句
25 resonant TBCzC     
adj.(声音)洪亮的，共鸣的
参考例句：
  • She has a resonant voice.她的嗓子真亮。
  • He responded with a resonant laugh.他报以洪亮的笑声。
26 primitive vSwz0     
adj.原始的；简单的；n.原(始)人，原始事物
参考例句：
  • It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
  • His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。
27 radically ITQxu     
ad.根本地，本质地
参考例句：
  • I think we may have to rethink our policies fairly radically. 我认为我们可能要对我们的政策进行根本的反思。
  • The health service must be radically reformed. 公共医疗卫生服务必须进行彻底改革。
28 fixed JsKzzj     
adj.固定的，不变的，准备好的；(计算机)固定的
参考例句：
  • Have you two fixed on a date for the wedding yet?你们俩选定婚期了吗？
  • Once the aim is fixed,we should not change it arbitrarily.目标一旦确定，我们就不应该随意改变。
29 paradoxes 650bef108036a497745288049ec223cf     
n.似非而是的隽语，看似矛盾而实际却可能正确的说法( paradox的名词复数 )；用于语言文学中的上述隽语；有矛盾特点的人[事物，情况]
参考例句：
  • Contradictions and paradoxes arose in increasing numbers. 矛盾和悖论越来越多。 来自辞典例句
  • As far as these paradoxes are concerned, the garden definitely a heterotopia. 就这些吊诡性而言，花园无疑地是个异质空间。 来自互联网
30 constraint rYnzo     
n.(on)约束，限制；限制(或约束)性的事物
参考例句：
  • The boy felt constraint in her presence.那男孩在她面前感到局促不安。
  • The lack of capital is major constraint on activities in the informal sector.资本短缺也是影响非正规部门生产经营的一个重要制约因素。
31 microscopic nDrxq     
adj.微小的，细微的，极小的，显微的
参考例句：
  • It's impossible to read his microscopic handwriting.不可能看清他那极小的书写字迹。
  • A plant's lungs are the microscopic pores in its leaves.植物的肺就是其叶片上微细的气孔。
32 annihilates 237828303df6464799066cd9d52294bc     
n.（彻底）消灭( annihilate的名词复数 )；使无效；废止；彻底击溃v.（彻底）消灭( annihilate的第三人称单数 )；使无效；废止；彻底击溃
参考例句：
  • Art has no influence upon action. It annihilates the desire to act. 艺术不能影响行为。它可以根绝干某种行动的愿望。 来自辞典例句
  • That which once you rode annihilates you. 昔时的坐骑，如今却要将你毁灭。 来自互联网
33 Forsaken Forsaken     
adj. 被遗忘的, 被抛弃的 动词forsake的过去分词
参考例句：
  • He was forsaken by his friends. 他被朋友们背弃了。
  • He has forsaken his wife and children. 他遗弃了他的妻子和孩子。
34 mechanism zCWxr     
n.机械装置；机构，结构
参考例句：
  • The bones and muscles are parts of the mechanism of the body.骨骼和肌肉是人体的组成部件。
  • The mechanism of the machine is very complicated.这台机器的结构是非常复杂的。
35 emission vjnz4     
n.发出物，散发物；发出，散发
参考例句：
  • Rigorous measures will be taken to reduce the total pollutant emission.采取严格有力措施，降低污染物排放总量。
  • Finally,the way to effectively control particulate emission is pointed out.最后，指出有效降低颗粒排放的方向。
36 Nazis 39168f65c976085afe9099ea0411e9a5     
n.（德国的）纳粹党员( Nazi的名词复数 )；纳粹主义
参考例句：
  • The Nazis worked them over with gun butts. 纳粹分子用枪托毒打他们。 来自《简明英汉词典》
  • The Nazis were responsible for the mass murder of Jews during World War Ⅱ. 纳粹必须为第二次世界大战中对犹太人的大屠杀负责。 来自《简明英汉词典》
37 conjecture 3p8z4     
n./v.推测，猜测
参考例句：
  • She felt it no use to conjecture his motives.她觉得猜想他的动机是没有用的。
  • This conjecture is not supported by any real evidence.这种推测未被任何确切的证据所证实。
38 conspire 8pXzF     
v.密谋，（事件等）巧合，共同导致
参考例句：
  • They'd conspired to overthrow the government.他们曾经密谋推翻政府。
  • History and geography have conspired to bring Greece to a moment of decision.历史和地理因素共同将希腊推至作出抉择的紧要关头。

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