科技英语入门课后答案

科技英语入门课后答案
科技英语入门课后答案

数学 mathematics 高等代数 higher algebra

解析几 analytical geometry 逻辑推理 logical deduction

物理定律 physical laws 既成定律 the established law

the law of conservation of energy 能量守恒定律

Newton’s theory of mechanics 牛顿力学定律

物体受热时,分子的平均速度提高。It is heating which

increases the average velocity of molecules in a body.

月球的确具有引力。The moon does have gravity.

就在我们闭合电路的那一瞬间,电流开始流动。

The very moment when the circuit is closed makes electricity flow.

增强型金属氧化物半导体

微分方程 differential equation 几何定理 geometrical theorem 模拟电子技术 analog electronics technology 双极型晶体管 bipolar transistor 晶体管效应 transistor effect 基极电流 base current 焊接 solder 引脚 pin speech waveform 语音波形peak-to-peak 峰到峰over modulated 过调制P 沟道 P slot enhancement metal-oxide-semiconductor

耗尽型金属氧化物半导体

数字集成电路 digital integrated circuit 放大器 amplifier exhausted metal-oxide-semiconductor

直流电路 DC circuit 逆时针方向 anti-clockwise

information-carrying waveform 承载信息的波形

trapezoidal wave 梯形波 触发器 flip-flop

frequency spectrum 频谱

集成电路 integrated circuit 散热片 heat sink 插座 holder data telephone line 电话线percent modulation 调制百分比脉冲调制 pulse modulation 平均功率 average power

周期信号 periodic signal 光波长 wavelength of light

数字逻辑电路 digital logic circuit 译码器 decoder 编码器 encoder 数值比较器 numeric comparator 组合逻辑电路 combinational logic circuits 寄存器 register 计数器 counter 数字电子技术 digital electronics

数据选择器 data selector

奇偶校验器 parity checker

时序逻辑电路 sequential logic circuits

上升沿 rising edge 下降沿 falling edge

异步触发 asynchronously trigger

同步触发 simultaneously trigger Based on transistors, various circuits According to the voltage condition, there are two aremanufactured

kinds which involve practical amplifiers, biasing circuits,

of MOS transistors: enhancement and exhausted.根据电

压的状况,金属氧化物半导体晶体管可以分为两种:

增强型和耗尽型。

operational amplifiers circuit, and other circuits:rectification, regulationand DC power supplies.基于晶体管,(人们)制成了各种各样的电路,包括实用放大器、偏置电路、运算放大电路和其他的电今天我们更多地用金属氧化物半导体(MOS )晶体管

路:

来做集成电路。Nowadays, more and more

metal-oxide-semiconductor transistors are used to

make integrated circuits.

整流电路、稳压电路和直流电源。

一般的集成电路芯片的引脚个数有 14 脚、20 脚、28 脚、

甚至更多。他们大多以逆时针方向排列。General

integrated circuit chips have 14 pins, 20 pins, 28 pins,

or even more. Most of the pins are arranged anti-clockwise.

We will consider three cases: amplitude modulation (AM),

in which the amplitude A varies with time; frequency

modulation (FM), in which the frequency w varies with

time; or phase modulation (PM), in which the phase phi

varies with time.我们考虑三种情况:调幅,其中幅度A 随时间变化;调频,其中频率w随时间变化;调相,其中相位 phi 随时间变化。

The constant m is called the modulation index. It specifies the fractional variation of the modulation function about its mean value.常数m叫做调制指数。它记录调制函数平均值的百分比变化。

一个完善的周期波,例如正弦波不能携带任何信息。

A perfectly periodic waveform, such as a sine wave cannot carry any information.

每当波形可表示为一系列正弦波的叠加时,各正弦

波的振幅可以用所谓频谱形象地显示出来。

When a waveform can be represented as the superposition of a series of sine waves, the amplitude of each sine wave can be shown by so called frequency spectrum.

经振幅调制的波的包络线与调制波形相同。

The envelope of the amplitude-modulated wave is identical to the corresponding modulation waveform.

给大家推荐一个英语微信群Empty Your Cup

英语微信群是目前学习英语最有效的方法,群里都是说英语,没有半个中文,而且规则非常严格,是一个超级不错的英语学习环境,群里有好多英语超好的超牛逼的人,还有鬼佬和外国美眉。其实坦白说,如果自己一个人学习英语太孤独,太寂寞,没有办法坚持,好几次都会半途而废。只要你加入到那个群里以后,自己就会每天都能在群里坚持学,坚持不停地说和练,由于是付费群,群里的成员学习氛围非常强,每天的训练度都非常猛,本来很懒惰的你一下子就被感染了,不由自主地被带动起来参与操练,不好意思偷懒,别人的刻苦学习精神会不知不觉影响你,Empty Your Cup英语微信群(进群加维新 601332975)可以彻底治好你的拖延症,里面学员都非常友好,总是给你不断的帮助和鼓励,让你在学英语的路上重新燃起了斗志,因为每天都在运用,你的英语口语就能得到了迅猛的提升,现在可以随便给一个话题,都能用英文滔滔不绝的发表5分钟以上对这个话题的看法和观点,想提高英语口语的可以加入进来,It really works very well.

研究生英语综合教程(课后习题答案)

Unit One Task 1 1.A 2.C 3.B 4.C 5.D 6.D 7.D 8.C 9.A 10.D 11.A 12.B Task 2 1.public(c) 2.discipline(b) 3.strength(a) 4.reference(a) 5.strength(d) 6.public(a) 7.demonstrated(b) 8.discipline(c) 9.references(c) 10.personality(a) 11.discipllining(d) 12.demonstrates(a) 13.public(d) 14.reference(b) 15.personality(c) Task 3 1.employment 2.paid 3.adjust 4.setting 5.discouraged 6.credit 7.cite 8.demonstrate 9.teamwork 10.rules Unit Two Task 1 1.A 2.B 3.B 4.C 5.B 6.A 7.B 8.C 9.A 10.C Task 2 1. bud (n.); budding (adj.) 2. access (n.); access (v.) 3. taste (n.);tasted (v.) 4. fool (n.); fooling (v.) 5. produces (v.); produce (n.) 6. garnish (v.); garnishes (n.) 7. reigns (v.); reign (n.) 8. concern (n.); concerned (v.) 9. named (v.); name (n.) 10. practiced (v.); practice (n.) Task 3 1) integration 2) choice 3) handed 4) aspiring 5) steaming 6) masterpieces 7) pleasure 8) partake 9) amazing 10) presented Unit Three Task 1 1.A 2.B 3.C 4.B 5.A 6.B 7.C 8.A Task 2 1. stack up against 2. struck a chord 3. amounted to 4. chopping off 5. appeal to 6. pick up on 7. turned out 8. fade away 9. brought together 10. pulled off 11. thrust upon 12. be kept clear of Task 3 1) swirling 2) delivered 3) glowed 4) intervals 5) converge 6) wanderings 7) navigate 8) jealousy 9) presence 10) absorbed Unit Four Task 1 1.A 2. A 3. C 4. B 5. B 6. C 7. D 8. C 9. A 10. C Task 2 1. maintained (a) 2. romantic (a)

英语课后翻译答案新

U n i t1 1. 任何年满18岁的人都有资格投票。(be eligible to, vote) Anyone over the age of 18 is eligible to vote. 2. 每学期开学前,这些奖学金的申请表格就会由学校发给每一个学生。(apply for, scholarship) A form to apply for these scholarships is sent by the university to every student before the start of every semester. 3. 遵照医生的建议,我决定戒烟。(on the advice of) On the advice of my doctor, I decided to give up smoking. 4. 公园位于县城的正中央。(be located in) The park is located right in the center of town. 5. 这所大学提供了我们所需的所有材料和设备。(facilities) The university provides all the materials and facilities we desire. 1. 他们花了多年的时间寻找内心的平静,但是收效甚微。(search for) They spent many years searching for peace of mind, but with little success. 2. 这种新药的成功研制已经使许多疾病的治疗发生了根本性的变革。

研究生学术综合英语课文翻译unit1-4

第一单元? 如何发表演说 斯蒂芬·卢卡斯? ???? 在人类创造的万物中,语言可能是最卓越的一项创造。通过语言,我们可以分享经验、阐明价值观念、交流思想、传播知识、传承文化。确实,语言对于思想本身至关重要。和流行的信仰不同的是:语言并不是简单地反映事实,而是通过对事件意义的思考来帮助人们感悟现实。? ???? 优秀的演说者尊重语言并懂得如何驾驭语言。语言是演说者展示才能的工具,对于他们来说,如同其他职业的工具一样,语言也有特殊的功用。作为一名演说者,你应该意识到话语的意义,并懂得如何准确无误地使用语言,使其表达清楚,趣味横生,恰如其分。? 如同数字对于会计的重要性一样,准确地使用语言对于演说者至关重要。在没有确切知道一个词语的意思之前,千万不要盲目使用。碰到没有把握的词语,一定要查词典追根究底。当你准备演讲之前,一定要不断地问自己:“我究竟想说些什么?我究竟想表达什么样的意思?”因此,对于一篇演讲稿的用词来说,必须准确无误。? 如果语言表达清楚无误,听众就能很快抓住你的意思。鉴于此,演说者应该使用那些对于大多数人来说非常熟悉的词语,这些词语不需要任何专业背景就能够理解;演说者应该使用那些表达具体而不是相对抽象的词语;并且千万不要乱堆砌辞藻,哗众取宠。? 准确生动地使用语言能够使你的演说贴近生活。有一种方法可以使你的语言更加生动形象,那就是通过展开联想或创造语言图示。通过使用表达具体的词语、明喻或者暗喻等手法可以展开想像。明喻是对事物不同之处的比较,不过有些是相同的:它们总是包含“像……一样”或者“如同……一样”这样的连词。暗喻是一种隐性的比喻,它能够把两个形式不同但是有一些相通之处的事物联系在一起,暗喻不包含“像……一样”或者“如同……一样”这样的连词。? 另一种让你的演说生动形象的方法是注重语言的节奏感。有四种修辞格可以让你的语言富有节奏感:排比、重复、头韵和对比。排比是将一组或一系列具有相似结构的词语、短语或者句子排列在一起;重复是在一系列短句或者长句的开头或者结尾使用相同的一句话或者一组词语;头韵是指邻近或者相邻的几个句子中的首个词语的辅音字母相同;对比是将一些意思相反的词语或者句子并列在一起,通常使用排比结构。 恰当地使用语言是指语言的运用要符合特定的场合、特定的观众和特定的主题。同时,恰当地使用语言还意味着演说者要有自己的语言风格,而不是模仿他人的口吻。如果演说者的语言在各个方面都能够做到恰如其分,那么这篇演说成功的机率就会大大提高。??????? 优秀的演说并不是空穴来风、缺乏论据的决断。演说者必须找到强有力的论据来支持其观点。实际上,熟练地使用论据经常是区别一篇优秀演说词和一篇空洞演说词的关键所在。一般来说,通常有三种论据材料:事例、统计数据和证词。? ???????在演说过程中,你可以使用一些简明扼要的例子——比如过去发生的一个很具体的事件——有时候,你可以罗列好几个简明的例子,借此增强听众的印象。扩展性的例子——描述、叙述或者奇闻轶事——通常长一些,但更具体。夸张性的例子描述想像中的情形,这种例子能够将相关的想法有效地传达给听众。这三种例子都能够帮助演说者理清思绪、加强印象或者使演说更加娓娓动听。为了使表达更加富有效果,例子应该生动活泼,丰富多彩。 只要演说者对于统计数据用之得当并且加以解释,这些数据将有助于有效地传达信息,听众也能从统计数据中获益匪浅。最重要的是:演说者应该对统计数据了如指掌,并且运用得恰如其分。由于数据很容易操纵和捏造,因此,对于演说者来说,一定要确保图表没有张冠李戴,并且要确保统计方法正确,数据来源可靠。?

《科技英语》课后习题答案

Main Content :UNIT 1 MA THEMA TICS I.Text Organization Parts Part One Paragraphs Paras. 1-3 Main Ideas Game theory can be defined as the science of strategy which studies both pure conflicts (zero-sum games) and conflicts in cooperative forms. Part Two Paras. 4-11 There are two distinct types interdependence: sequential-move simultaneous-move game.of strategic game and Part Three Paras.The typical examples of game theory are given as the 12-19basic principles such as prisoners’dilemma, mixing moves, strategic moves, bargaining, concealing and revealing information. Part Four Para. 20 The research of game theory has succeeded in illustrating strategies in situations of conflict and cooperation and it will focus on the design of successful strategy in future.

最新基础综合英语课后习题翻译Unit1-6-邱东林版

李明是学化学的,性格开朗幽默,颇有魅力,但英语成绩不佳,每次只能勉强及格。老师警告他,英语不好会阻碍他拿奖学金,并亮出了自己的王牌:如果李明不努力,就让他考试不过关。老师还告诉他,学习英语不能只为了文凭,否则他即使大学毕业,也还是个半文盲。李明虽然保持镇定,但他明白,他的学业生涯正在攸关之际,必须安心下来埋头学习,坚持不懈。 Li Ming was a chemistry major, a charmer noted for his easygoing and humorous temperament. However, his English was so poor that he always barely got by. The teacher admonished him that his poor English would be an impediment to scholarship. What’s more, she showed her trump card: if Li Ming did not work hard. She would flunk him. He was also told that he should not learn English merely for the sake of his diploma, otherwise, even after graduation from university, he would still be semiliterate. Although Li Ming did not lose his composure, he was well aware that he had to settle down to work and follow through because his academic life was at stake. Unit 2 我的朋友琳达接受过良好的教育,既美丽又端庄,三十好几依然没有人向她求婚。究其原因,她的事业心极强,整日扑在工作上,每天来往于住处和公司之间,根本没有时间和异性交往。一想到女儿这么大了还单身一人,她父母就焦虑不安。他们不知道该如何是好,甚至还去咨询一些社会学专家。但是事情在上个月出现了转机,公司的总部调琳达到培训部。在新的工作岗位上,琳达遇到了第一个触动她心弦的男人。从此,他们几乎每天约会,琳达意识到她会不顾一切地爱这个男人。决定嫁人的时候,她告诉了我这个好消息。虽然琳达的爱情让人想起电影中才会有的浪漫故事,我也担忧未来究竟会怎样,但我还是表达了我由衷的祝福,并爽快答应在婚礼那天做他们的伴娘和伴郎随从中的一员。 Linda, my good friend, has received good education and is both beautiful and elegant. She was not proposed to even when she was well over thirty. The reason is that she, as a career –oriented woman, is devoted to her work. Navigating between home and the company, she had hardly any time to socialize with people of the opposite sex. Her parents were gripped by anxiety at the thought of their daughter still remaining single at such an age. They did not know what to do and even consulted with some sociologists. But the situation began to change last month, when the headquarters of the company transferred Linda to the training department. On the new post, Linda met a man who tugged on her heartstrings for the first time. Ever since then, they dated virtually on a daily basis, and Linda realized that she would love the man beyond all reason. When she decided to take the matrimonial plunge, she informed me. Though Linda’s love is reminiscent of the romance that we see only in movies and I don’t know what the future will hold for her, I give her my heart-felt wishes and agree readily to be a member of the entourage of bridesmaids and groomsmen.

(完整word版)学术综合英语课后答案解析

Unit 1 C 1.The younger generation should continue to sustain and develop our fine traditions and long-standing culture. 2.In the course of preparing one’s speech, one should be clearly aware of how one could make effective use of statistics and examples to bolster one’s point of view. 3.An impromptu speech is one of the speaking skills that college students should learn and develop through practice. 4.By using simile and metaphor, you can make your language more vivid and more attractive to your audience. 5.The proper examples you cite might help reinforce the impression on your listeners and make your viewpoints more convincing. 6.When you are speaking, you should choose common and easy words and at the same time avoid clutter in your speech.

基础综合英语_1-5单元课后翻译

作文翻译 Unit 1 李明是学化学的,性格开朗幽默,颇有魅力,但英语成绩不佳,每次只能勉强及格。老师警告他,英语不好会阻碍他拿奖学金,并亮出了自己的王牌:如果李明不努力,就让他考试不过关。老师还告诉他,学习英语不能只为了文凭,否则他即使大学毕业,也还是个半文盲。李明虽然保持镇定,但他明白,他的学业生涯正在攸关之际,必须安心下来埋头学习,坚持不懈。 Li Ming was a chemistry major, a charmer noted for his easygoing and humorous temperament. However, his English was so poor that he always barely got by. The teacher admonished him that his poor English would be an impediment to scholarship. What’s more, she showed her trump card: if Li Ming did not work hard. She would flunk him. He was also told that he should not learn English merely for the sake of his diploma. otherwise, even after graduation from university, he would still be semiliterate. Although Li Ming did not lose his composure, he was well aware that he had to settle down to work and follow through because his academic life was at stake. Unit2 我的朋友琳达接受过良好的教育,既美丽又端庄,三十好几依然没有人向她求婚。究其原因,她的事业心极强,整日扑在工作上,每天来往于住处和公司之间,根本没有时间和异性交往。一想到女儿这么大了还单身一人,她父母就焦虑不安。他们不知道该如何是好,甚至还去咨询一些社会学专家。 但是事情在上个月出现了转机,公司的总部调琳达到培训部。在新的工作岗位上,琳达遇到了第一个触动她心弦的男人。从此,他们几乎每天约会,琳达意识到她会不顾一切地爱这个男人。决定嫁人的时候,她告诉了我这个好消息。 虽然琳达的爱情让人想起电影中才会有的浪漫故事,我也担忧未来究竟会怎样,但我还是表达了我由衷的祝福,并爽快答应在婚礼那天做他们的伴娘和伴郎随从中的一员。 Linda, my good friend, has received good education and is both beautiful and elegant. She was not proposed to even when she was well over thirty. The reason is that she, as a career –oriented woman, is devoted to her work. Navigating between home and the company, she had hardly any time to socialize with people of the opposite sex. Her parents were gripped by anxiety at the thought of their daughter still remaining single at such an age. They did not know what to do and even consulted with some sociologists. But the situation began to change last month, when the headquarters of the company transferred Linda to the training department. On the new post, Linda met a man who tugged on her heartstrings for the first time. Ever since then, they dated virtually on a daily basis, and Linda realized that she would love the man beyond all reason. When she decided to take the matrimonial plunge, she informed me. Though Linda’s love is reminiscent of the romance that we see only in movies and I don’t know what the future will hold for her, I give her my heart-felt wishes and agree readily to be a member of the entourage of bridesmaids and groomsmen. Unit 3 食品供应商缺乏诚信已经成为当今社会的一大问题。部分企业欺骗公众,故意散布假消息,颂扬食品添加剂是食品工业的伟大成就,并声称适量的添加剂对健康有益无害。部分有良知的科学家对食品添加剂的含量和毒性展开了深入的病理学研究。研究结果表明,部分常见的食品添加剂经长期,可能会对健康产生危害,这被认为是食品安全研究方面极为重要的

英语课后翻译答案

Unit1 1、任何年满18岁得人都有资格投票。(be eligible to, vote) Anyone over the age of 18 is eligible to vote、 2、每学期开学前,这些奖学金得申请表格就会由学校发给每一个学生。(apply for, scholarship) A form to apply for these scholarships is sent by the university to every student before the start of every semester、 3、遵照医生得建议,我决定戒烟。(on the advice of) On the advice of my doctor, I decided to give up smoking、 4、公园位于县城得正中央。(be located in) The park is located right in the center of town、 5、这所大学提供了我们所需得所有材料与设备。(facilities) The university provides all the materials and facilities we desire、 1、她们花了多年得时间寻找内心得平静,但就是收效甚微。(search for) They spent many years searching for peace of mind, but with little success、 2、这种新药得成功研制已经使许多疾病得治疗发生了根本性得变革。(revolutionize) The successful development of the new drug has revolutionized the treatment of many diseases、 3、由于这个国家得经济不景气,这家公司濒于破产。(on the edge of) The company is on the edge of bankruptcy due to the economic depression in the country、 4、大学毕业后她成为了一名护士。她认为护士这一职业可能很有发展前途。(rewarding) He became a nurse after college、He thought nursing could be a very rewarding career、 5、她像往常一样在文件上签了名。(just as) He signed his name on the paper just as he has always done it、 Unit2

学术综合英语unit1_5课后习题答案解析

Task 2 A contrary to implicit assertion look up adapted Sustain unbiased In the course of metaphor clutter B bolster credible impromptu sparingly anecdote Credentials testimony hypothetical paraphrase juxtaposition Task 3 Translation B.发言提纲是有效发言的基础。通过写发言提纲,你可以确保你的思想是相关联的,你的思路从一点谈到另一点,你的讲话结构是连贯的。通常,准备讲演你可以采用两种提纲方式:详细准备提纲和简单发言提纲。 在准备发言提纲中,应该写出你的特定目的及中心思想,并以连贯的方式确定主要观点和次要观点,发言提纲应该由简要的提要组成,这些提要在你讲话时能够给予你一些帮助。发言提纲还应该包括帮助你记忆的重点词或重点短语。在写发言提纲时,可采用准备提纲的模式,尽可能使你的发言提纲简要,同时,要确保提纲清晰,易于辨认。 C. 1. The younger generation should continue to sustain and develop our fine traditions and long-standing culture. 2. In the course of preparing one’s speech, one should be clearly aware of how one could make effective use of statistics and examples to bolster one’s point of view. 3. An impromptu speech is one of the speaking skills that college students should learn and develop through practice. 4. By using simile and metaphor, you can make your language more vivid and more attractive to your audience. 5. The proper examples you cite might help reinforce the impression on your listeners and make your viewpoints more convincing. 6. When you are speaking, you should choose common and easy words and at the same time avoid clutter in you speech. 7. When you write a paper, citing the views from some experts is a good way to make your ideas more credible. 8. A good method of delivering a speech will improve its quality and will help convey the speakers’ ideas clearly and interestingly. 9. You should mot blindly use a word that you are not sure about, and if you are not sure, look up the word in a dictionary. 10. Your language should adapt to the particular occasion and audience. If your language is appropriate in all respects, your speech is successful. D. Before you deliver an academic speech, you should, first of all, get well prepared for it. Then, you should make your major points clear in your speech, and your speech should be well organized. When speaking, you should not speak too fast, and your language should be exp licit. Don’t always read the notes you prepared beforehand. From time to time, you should look at your audience. On one hand, you can show your respect to your audience, and on the other hand, you will be able to go on with your speech more smoothly.

科技英语翻译课后答案

科技英语翻译课后答案 High quality manuscripts are welcome to download

科技英语翻译翻译的标准 第1节翻译练习1 The power plant is the heart of a ship. The power unit for driving the machines is a 50-hp induction motor. 动力装置是船舶的心脏。 驱动这些机器的动力装置是一台50马力的感应电动机。 第1节翻译练习2 Semiconductor devices, called transistors, are replacing tubes in many applications. Cramped conditions means that passengers’ legs cannot move around freely. All bodies are known to possess weight and occupy space. 半导体装置也称为晶体管,在许多场合替代电子管。 我们知道,所有的物体都有重量并占据空间。 空间狭窄,旅客的两腿就不能自由活动。 第1节翻译练习3 The removal of minerals from water is called softening. A typical foliage leaf of a plant belonging to the dicotyledons is composed of two principal parts: blade and petiole. 去除水中的矿物质叫做软化。 双子叶植物典型的营养叶由两个主要部分组成:叶片和叶柄。

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新视野大学英语课后习 题翻译答案 -CAL-FENGHAI.-(YICAI)-Company One1

新视野大学英语(第二版)读写教程2 1至7单元课后翻译答案总结 IA:她连水都不愿意喝一口,更别提留下来吃饭了。 She wouldn’t take a drink , much less would she stay for dinner. 他认为我在对他说谎,但实际上我讲的是实话。 He thought I was lying to him , whereas I was telling the truth. 这个星期你每天都迟到,对此你怎样解释 How do you account for the fact you have been late every day this week 他们利润增长的部分原因是采用了新的市场策略。 The increase in their profits is due to their new market strategy. 这样的措施很可能会带来工作效率得提高。 Such measures are likely to result in the improvement of work efficiency.

我们已经在这个项目上投入了大量时间和精力,所以我们 只能继续。 We have already poured a lot of time and energy into the project , so we have to carry on. IIA: 尽管她是家里的独生女,他父母也从不溺爱她。 Despite the fact that she is the only child in the family , her parents never baby her . 迈克没来参加昨晚的聚会,也没有给我打电话作任何解 释。 Mike didn’t come to the party last night , nor did he call me to give an explanation. 坐在他旁边的那个人确实发表过一些小说,但绝不是什么 大作家。 The man sitting next to him did publish some novels , but he is by no means a great writer. 他对足球不感兴趣,也从不关心谁输谁赢。 He is not interested in football and is indifferent to who wins or loses.

科技英语综合教程课后练习答案及参考译文

科技英语综合教程课后练习答案及参考译文

————————————————————————————————作者:————————————————————————————————日期: 2

Unit 1 搏弈论 阿维纳什?迪克斯特&巴里?内尔巴夫 搏弈是有关策略的科学。它试图以数学和逻辑的方法来帮助搏弈者作出决策,在一系列纷繁复杂的搏弈中应采取何种策略来保证自己获得最大利益。搏弈论研究的搏弈的范围包括了从下棋到抚育儿童,从网球竞技到公司转手。但是所有的博弈都具有一个共同的特征:相互作用。也就是说,每一个博弈者的博弈结果取决于所有博弈参与者的策略选择。在零和搏弈中,搏弈者的利益之间是完全冲突的,因此一方的得利必然导致另一方的损失。更多具有代表性的例子还有会导致共同得利(正和)搏弈和共同损失(负和)搏弈,同样的情况还会发生在另外一些冲突中。 搏弈论研究的先驱者是普林斯顿数学家约翰?冯?诺依曼。在早先的一段时间里,研究的重点被放在了完全冲突(零和)搏弈(非合作搏弈)上,其他的搏弈当时被认为是以合作形式出现。也就是说,搏弈要求参与者共同地选择和实施他们的行为.最近的研究则把重点放在了那些既不属于零和搏弈也不属于绝对合作搏弈的情况上,在这些搏弈中,搏弈者自主地选择搏弈行为,但他们之间的相互关系中充满了合作与竞争。 搏弈行为与我们在中性环境中所作的各种决定有着根本性的不同。要说明这一点,我们可以思考一下伐木工人和军队将军所作决定之间的不同。当伐木工人决定要如何砍树时,他不会考虑树木本身会有什么反抗,他所处的环境为中性。而当将军决定要消灭敌军时,他必须提前预料到并消除敌军的反抗。与这一例子中的将军相类似,一个搏弈者必须认识到他与其他机智且怀有争胜之心的竞争者之间的相互作用,他自己所作的决定也必须能够同时应对可能出现的合作或冲突。 搏弈的实质是搏弈者采取策略之间的相互依赖性。这种策略性的相互依赖表现为两个不同的类别:连续策略之间的相互作用以及联立策略之间的相互作用。就前者而言,搏弈者依次采取行动,每个人都会注意其他搏弈者先前的行为。就后者而言,搏弈者同时采取行动,每个人都会忽略其他搏弈者当前的行为。 对连续策略博弈中的某一博弈这来说,一个普遍的原则就是放眼前方,及时反思和总结。每个博弈者应该弄清楚其他博弈者会对他当前的策略行为做出怎样的回应,他自己将如何应对等情况。博弈者要预料到他的最初决定会最终导致何种结果,并且运用对形势的判断来计划好当前的最佳策略。在考虑其他博弈者会如何应对时,博弈者必须能设身处地地换位思考,而不能把自己的主观判断强加与人。 从理论上说,采取固定次序行动的任何连续博弈都可以圆满地完成。我们可以通过预测每个可能的结果来决定各个博弈者的最佳策略。例如象井字棋(tic-tac-toe)这样的简单游戏由于可以以这样的方式完成,因而并不具有挑战性。但诸如象象棋等的其他博弈,即使是借助电脑的帮助,由于其本身的计算过程过于复杂而难以在实践中去实施。因此,博弈者往往会会依据经验提前对形势作出判断并尽可能的评估最终的局面。 与连续策略博弈的线形思维不同的是,采取共发性策略的博弈要求逻辑思维。在忽略其他参与者当前策略的情况下,尽管博弈者们同时采取行动,每一个参与者必须清楚的意识同时还会有其他的参与者在依次关注整个博弈过程。这时的思维模式可描述为:我想他认为我会这样考虑…。因此,博弈者必须从全体博弈者的立场出发并努力判断出最终的博弈结果。每个参与者的个人最佳行为都是全局谋划中不可或缺的一部分。 运用普林斯顿数学家约翰?纳什提出的均衡概念,可以推导出这种逻辑思维的结论。我们寻求一系列的策略组合,每个博弈者都会有自己的选择,当所有的对手们在实施他们决定的最佳策略时,我们所做的选择应该对自己是最有利的。换句话说,每个博弈者都会对其他人的策略作出最优化的应对。 有时, 无论其他博弈者如何行动,博弈的一方的最佳策略组合始终如一,这被称作这一博弈者的优策略。在其他情况下,如果博弈者的策略始终于己不利,则被称作劣策略,其含义是指无论其他博弈者如何行动,对手的策略总是优于自己。因此,谋求策略均衡应该从寻找优策略和消除劣策略开始。 当我们把博弈的结果表述为一种均衡的时候,并不是基于以下的假设:即博弈的每个参与者的个人最佳策略将会带来共同的最优化结果。确实也存在着一些糟糕的例子,比如囚徒困境(见下文),由于囚徒们都追求个人私利的最大化而导致了全体参与者的困境。纳什的关于均衡的定义还不能完全解决联立策略博弈中逻辑推理思考的问题,有些博弈包含多种此类的均衡,而有些博弈却并不包含这样的均衡。纳什均衡也还没有清楚地说明关于导致均衡的动态过程。尽管有这样的一些缺陷,纳什均衡的定义已被证明在分析策略性互动时具有重要作用。 以下策略性互动的实例可以说明博弈论的一些基本理论框架: 囚徒困境。两个嫌疑犯分别被审问,每个人都可以招供或保持沉默。如果嫌犯A保持沉默,嫌犯B可以通过招供而获得较轻的发落。如果嫌犯A招供,嫌犯B最好选择招供以免被从重处理。这时招供就是嫌犯B的优策略。同样的情况也适用与B。因此,在均衡的

研究生基础综合英语unit1-8课后习题汉翻英.

翻译 Unit 1 李明是学化学的,性格开朗幽默,颇有魅力,但英语成绩不佳,每次只能勉强及格。老师警告他,英语不好会阻碍他拿奖学金,并亮出了自己的王牌:如果李明不努力,就让他考试不过关。老师还告诉他,学习英语不能只为了文凭,否则他即使大学毕业,也还是个半文盲。李明虽然保持镇定,但他明白,他的学业生涯正在攸关之际,必须安心下来埋头学习,坚持不懈。 Li Ming was a chemistry major, a charmer noted for his easygoing and humorous temperament . However, his English was so poor that he always barely got by. The teacher admonished him that his poor English would be an impediment to scholarship. What’s more, she showed her trump card: if Li Ming did not work hard. She would flunk him. He was also to ld that he should not learn English merely for the sake of his diploma. otherwise, even after graduation from university, he would still be semiliterate. Although Li Ming did not lose his composure, he was well aware that he had to settle down to work and follow t hrough because his academic life was at stake. Unit2 我的朋友琳达接受过良好的教育,既美丽又端庄,三十好几依然没有人向她求婚。究其原因,她的事业心极强,整日扑在工作上,每天来往于住处和公司之间,根本没有时间和异性交往。一想到女儿这么大了还单身一人,她父母就焦虑不安。他们不知道该如何是好,甚至还去咨询一些社会学专家。但是事情在上个月出现了转机,公司的总部调琳达到培训部。在新的工作岗位上,琳达遇到了第一个触动她心弦的男人。从此,他们几乎每天约会,琳达意识到她会不顾一切地爱这个男人。决定嫁人的时候,她告诉了我这个好消息。虽然琳达的爱情让人想起电影中才会有的浪漫故事,我也担忧未来究竟会怎样,但我还是表达了我由衷的祝福,并爽快答应在婚礼那天做他们的伴娘和伴郎随从中的一员。 Linda, my good friend, has received good education and is both beautiful and elegant. She was not proposed to even when she was well over thirty. The reason is that she, as a career -oriented woman, is devoted to her work. Navigating between home and the company, she had hardly any time to socialize with people of the opposite sex. Her parents were gripped by anxiety at the thought of their daughter still remaining single at such an age. They did not know what to do and even consulted with some sociologists. But the situation began to change last month, when the headquarters of the company transferred Linda to the training department. On the new post, Linda met a man who tugged on her heartstrings for the first time. Ever since then, they dated virtually on a daily basis, and Linda realized that she would love the man beyond all reason. When she decided to take the matrimonial plunge, she informed me.Though Linda’s love is reminiscent of the romance that we see only in movies and I don’t know what the future will hold for her, I give her my heart-felt wishes and agree readily to be a member of the entourage of bridesmaids and groomsmen. Unit3食品供应商缺乏诚信已经成为当今社会的一大问题。部分企业欺骗公众,故意散布假消息,颂扬食品添加剂是食品工业的伟大成就,并声称适量的添加剂对健康有益无害。部分有良知的科学家对食品添加剂的含量和毒性展开了深入的病理学研究。研究结果表明,部分常见的食品添加剂经长期,可能会对健康产生危害,这被认为是食品安全研究方面极为重要

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