涉海英語讀寫教程課后題答案第六單元.

1、涉海英語讀寫教程課后答案（第六單元）Unit 6 Marine Resources ExploitationText A Part IUnderstanding and LearningBackground information1. Green energyIt is also called sustainable energy or renewable energy. It is the sustainable provision of energy that meets the needs of the present without compromising the ability o

2、f future generations to meet their needs. It includes hydroelectricity, solar energy, wind energy, wave power, geothermal energy, and tidal power,etc.2. Tidal power It is also called tidal energy, is a form of hydropower that converts the energy of tides into useful forms of power - mainly electrici

3、ty. Although not yet widely used, tidal power has potential for future electricity generation. Tides are more predictable than wind energy and solar power. Among sources of renewable energy, tidal power has traditionally suffered from relatively high cost and limited availability of sites with suffi

4、ciently high tidal ranges or flow velocities, thus constricting its total availability. However, many recent technological developments and improvements, both in design (e.g. dynamic tidal power, tidal lagoons) and turbine technology (e.g. new axial turbines, cross flow turbines), indicate that the

5、total availability of tidal power may be much higher than previously assumed, and that economic and environmental costs may be brought down to competitive levels. Historically, tide mills have been used, both in Europe and on the Atlantic coast of North America. The earliest occurrences date from th

6、e Middle Ages, or even from Roman times. The world's first large-scale tidal power plant (the Rance Tidal Power Station) became operational in 1966.3. Wave power Wave power is the transport of energy by ocean surface waves, and the capture of that energy to do useful work for example, electricit

7、y generation, water desalination, or the pumping of water (into reservoirs). Machinery able to exploit wave power is generally known as a wave energy converter (WEC).Wave power is distinct from the diurnal flux of tidal power and the steady gyre of ocean currents. Wave power generation is not curren

8、tly a widely employed commercial technology although there have been attempts at using it since at least 1890. In 2008, the first experimental wave farm was opened in Portugal, at the Aguçadoura Wave ParkDetailed Study of the Text1. Engineers have long fantasised about harnessing all that energ

9、y, and with climate change and energy security now pressing political problems, ministers are taking them seriously. (Para.3)Meaning: Engineers have been conceiving fanciful idea that people tap tidal power which may not be supported by ministers. But now things seem to change. Because of climate ch

10、ange caused by green-house emissions and energy security in the sense energy is playing an increasingly critical role to a country, ministers are taking exploitation of tidal power into serious consideration.fantasise vi. (often followed by about )conceive fanciful or extravagant notions, ideas, sup

11、positions, or the likee.g. to fantasize about the ideal job. 異想天開找個(gè)理想工作vt. create in one's fancy, daydreams, or the like; imaginee.g. to fantasize a trip through space. 想象去太空旅行。harness v. bring under conditions for effective use; gain control over for a particular ende.g. to harness water p

12、ower/ the energy of the sun. 利用水能/太陽能2. It is easy to see the attraction of such schemes. Tidal energy is the best-behaved of renewable sources. (Para.4)Meaning: The projects of tidal energy have the obvious advantages because tides are predictable.3. Such a scheme could put a noticeable dent in Bri

13、tish carbon emissions, but greens concerned about the local environment are unhappy.(para.5)Meaning: The scheme of harnessing tidal power could reduce carbon emissions. But environmentalists dont agree to it.dent n. a small hollow made by pressure or a blow e.g.My car has a dent where it hit a tree.

14、 我的車在和樹相撞的地方留下了凹陷。v . make such a hollow in e.g.The car was dented when it hit a wall.車撞墻上了，車身凹了進(jìn)去。 ingeduik promáknout (se) bule; lave bule verbeulen abollar mõlki lööma kolhia bosseler ulupiti, uleknuti (be)horpaszt memenyokkan beygla ammaccare lenkti iespiest; atstt iespiedumu

15、 menjadi kemik deuken bulke, lage bulk wgniata amolgar a îndoi prebori (sa), pokodi udreti udubiti buckla till, bli tillbucklad yamultmak 使凹下 ; làm lõm 使凹下make a dent in something  1) (Lit.) make a depression in somethinge.g.I kicked the side of the car and made a dent in it. 我把車

16、的側(cè)面踢的凹陷進(jìn)去了。2) (Fig. ) use only a little of something; to make a small amount of progress with somethinge.g. I've been slaving all day, and I have hardly made a dent in my work.我干了一天活，但工作仍然沒什么進(jìn)展。4. Some simply think it would be an eyesore. (Para.6)Meaning: Some people are not happy with the proje

17、cts because they think the barrages and lagoons are ugly to view.eyesore: n. something, such as a distressed building, that is unpleasant or offensive to view.sore a. 1)painful e.g. My leg is very sore; I have a sore leg.我腿酸2) suffering pain e.g. I am still a bit sore after my operation. 手術(shù)后我仍然

18、有點(diǎn)疼。3 )(American) irritated, annoyed or offended e.g. He is still sore about what happened. 他仍然為發(fā)生的事情惱怒。n. a painful, injured or diseased spot on the skine.g. His hands were covered with horrible sores. 他手上布滿傷口。5. And as one of the worlds largest engineering projects, it would, of course, be a

19、long-lasting monument to whichever politician approved it. (Para.8)long-lasting: a. existing or persisting for a long time; everlasting: a. 1)lasting forever; eternal.2)continuing indefinitely or for a long period of time.3) persisting too long; tedious: e.g. everlasting complaints.不停的抱怨enduring a .

20、lasting; continuing; durablee.g.This chance meeting was the start of an enduring friendship. 這次偶然的相遇是一段持久友情的開始。 6.One reason for the expense of wave power is the need to make the equipment impervious to storm damage and corrosion. (Para.10)impervious a.1) incapable of being penetrated: e.g.a materia

21、l impervious to water.防水材料2) incapable of being affected: e.g.impervious to fear.不害怕corrosion n. 1) the act or process of corroding; the condition produced by corrodinge.g.Zinc is used to protect other metals from corrosion. 鋅被用來保護(hù)其他金屬免受腐蝕。2)a substance, such as rust, formed by corrodingcorrode: vt.

22、 1) destroy a metal or alloy gradually, especially by oxidation or chemical action: e.g.Rust has corroded the steel rails.銹侵蝕了鋼軌。2）impair steadily; deteriorate: e.g. Doubt and mistrust could creep into our lives, corroding personal and professional relationships.懷疑與不信任悄悄走進(jìn)我們的生活，損害了人與人之間的關(guān)系和工作關(guān)系。e.g.

23、Jealousy corroded her character.嫉妒損傷了她的人格。vi be eaten or worn away.7.But the new device, called the Snapper, increases efficiency still further. (Para.12)Meaning：The new device，called the Snapper, increases efficiency further than Pelamis Wave Energy Convertors.8.Having spent years floundering in th

24、e water, could wave power finally be ready to make a splash? (Para. 12)Meaning: Wave power has made little or a little progress for years and now will get a lot of public attention thanks to technology advancement.flounder v. 1) make clumsy attempts to move or regain one's balancee.g. Three men

25、were floundering about in the water. 3名男子正在水中掙扎。2)to move or act clumsily and in confusion.e.g. What a pity that his career was left to flounder. 真遺憾，他的事業(yè)陷入了困境。make a splash: get a lot of public attention His latest novel was making a splash in literary circles and is on the best-seller list.他最新的小說在

26、文學(xué)圈里引起了人們關(guān)注, 成為暢銷書之一。Part IIPre-reading QuestionsBefore you read the text, take a few minutes to think about the following questions:1. What is “green energy”? Could you name some of green energy?It is also called sustainable energy or renewable energy. It is the sustainable provision of energy that

27、 meets the needs of the present without compromising the ability of future generations to meet their needs. It includes hydroelectricity, solar energy, wind energy, wave power, geothermal energy, and tidal power,etc.2. What are strengths and weaknesses of tidal and wave power?openExercisesI. Reading

28、 ComprehensionA1. What is the status quo of British tidal and wave power?The potential of tidal and wave power is vast in Britain. But the governments record on exploiting them is poor. In 2005, Britain got less than 2%of its energy from renewable sources(mostly wind). This was considerably below th

29、e European average of 6.7% and far behind countries such as Denmark or Sweden.2. The British government outlined a shortlist on Jan. 26 of 2006. What is it about?On January 26th the government published a shortlist of possible projects, including three barrages (essentially gigantic dams) and two ti

30、dal lagoons (man-made tanks in the sea which fill up and empty with the tide).3. On what grounds do some environmentalists oppose the new scheme on tidal power exploitation?The Severn estuary is an important habitat for birds; large barrages would destroy or damage much of it, as well as interfere w

31、ith fish stocks in the river.4. What is the biggest problem of wave power generators?They are relatively expensive.5. In what way, Pelamis does Wave Energy make a balance between resilience and efficiency?The Pelamis's design avoids the trade-off between resilience and efficiency by switching to

32、 a higher-efficiency mode in calm seas.6. How does the new device, the Snapper, work?It works much like a typical linear generator, in which a magnet is moved up and down inside coils of wire, inducing electrical currents in the process. But there is a crucial difference: alongside the coils are a s

33、econd set of magnets of alternating polarity. II. Structure AnalysisPart 1: Status Quo of tidal and wave power in Britain (Paras.1-2)The potential of tidal and wave power is vast while the governments record on exploitation is poor. Part 2: New tidal power project (Paras.3-8)Location: the river Seve

34、nProject includes: three barrages, and two tidal lagoonsAttraction of the project: 1. best-behaved2. unpredictable 3. generating huge electricityWeaknesses of the project: 1. on environmental grounds, it may interfere with habitats for birds and fish stocks near or in the river.2. on economic ground

35、s, it requires taxpayer funding；a barrage affect shipping; it may be an eyesore.Prospect of the project:The conservatives are not opposed because it will create jobs and work for firms.Part 3: New types of wave-power generators (Paras.9-12)Name: Pelamis Wave Energy Converters (3 articulated pontoons

36、)Location: Near Póvoa de Varzim, off the northern coast of PortugalStrength: It avoids the trade-of betweenresilience and efficiency by switching to ahigher-efficiency mode in calm seas. The biggest problem in the past: wave-power generators are relatively expensive. One new type of generator:N

37、ame: SnapperSimilarity with the typical linear generator: A magnet is moved up and down inside coils of wire.Important difference with the old one: Alongside the coils are a second of magnets of alternating polarity.Advantage of the new invention: The magnets can move up and down in jerky fashion wh

38、ich is more suitable to generate electricity. And then it raises efficiency further.The other new device: III Vocabulary StudyA1.shortlist2. immutable3.drastically4.impervious5. trade-off6. Resilience7. linear8. jerky9. flounder10. dentB. 1. C 2. C 3.B 4.C 5.A6. B 7.C 8.A 9.C 10.BC. 1. square up2.ma

39、ke headway3.far behind4.concern about5.in power. Cloze1harnessed2full3amount4generators5through6entirely7worthwhile8handful9suited10annual11mechanics12flow13predictable14associated15But16save17does18cost19estimated20produceV. TranslationA. 但是，事情現(xiàn)在似乎出現(xiàn)了轉(zhuǎn)機(jī)。據(jù)英國海洋動(dòng)力傳送公司的安德魯斯科特稱，在靠近葡萄牙北海岸的瓦爾津附近，有三根長150米蛇

40、形浮筒，被稱為“海蛇號(hào)”的海浪能轉(zhuǎn)換器正翹首以待，準(zhǔn)備接入國家電網(wǎng)。英國海洋動(dòng)力傳送公司是“海蛇號(hào)”的制造商。每根浮筒沿其長度都裝有三個(gè)動(dòng)力轉(zhuǎn)換模塊，這些模塊將浮筒銜接處不斷牽動(dòng)搖擺產(chǎn)生的動(dòng)能轉(zhuǎn)變?yōu)殡娔埽@就像蛇受到海浪拍打而扭動(dòng)一樣。這三條“蛇”是建立一座擁有24兆瓦特發(fā)電量的海浪能發(fā)電廠的第一步，屆時(shí)該發(fā)電廠能夠?yàn)?5000戶家庭供電。“海蛇號(hào)”鋪設(shè)在平靜海面上。這種設(shè)計(jì)是更高效的模式，從而避免了彈性和效率不可兼顧的矛盾。 不過一臺(tái)被稱作“笛鯛”的新裝置能夠進(jìn)一步提高其工作效率。埃得斯普納認(rèn)為，當(dāng)對(duì)一臺(tái)高速運(yùn)轉(zhuǎn)的發(fā)電機(jī)施加一個(gè)很小的作用力時(shí)，往往會(huì)把發(fā)電機(jī)的效率最大地發(fā)揮出來而海浪提供的外

41、力則恰恰相反。笛鯛”的發(fā)明人，基地設(shè)在英國達(dá)勒姆附近的顧問工程師如是說。他發(fā)明的裝置運(yùn)轉(zhuǎn)起來就像一臺(tái)典型的直線發(fā)動(dòng)機(jī)。在裝置內(nèi)，磁鐵在線圈內(nèi)上下移動(dòng)從而產(chǎn)生電流。但和典型發(fā)動(dòng)機(jī)的一個(gè)重大的區(qū)別是：沿線圈旁放置了另一塊同線圈內(nèi)那塊磁極相反的磁鐵。這樣可以避免線圈中央的磁鐵上下移動(dòng)的幅度過小。否則，磁力會(huì)不斷阻止磁鐵的運(yùn)動(dòng)，這樣磁鐵的運(yùn)動(dòng)便會(huì)時(shí)斷時(shí)續(xù)。其結(jié)果會(huì)導(dǎo)致磁鐵以一系列短促、快速的方式運(yùn)動(dòng)，這種運(yùn)動(dòng)比起緩慢、小幅的運(yùn)動(dòng)更有利于發(fā)電。早期的測(cè)試表明，這種裝置的效率有可能達(dá)到現(xiàn)存海浪能發(fā)電機(jī)工作效率的十倍以上。人們已經(jīng)在海水中苦苦尋覓了這么多年，海浪是否能夠最終濺起一絲靈光呢？BTidal po

42、wer is not only one of green energy, but also its potential is vast. But compared to Denmark and Sweden, the British governments exploitation is not satisfying. But now things seem to be changing. The project of the British government could provide an enormous boost. It will build three barrages and

43、 two tidal lagoons on the river Severn which has the second highest tidal range in the world. Unlike wind or wave power and alike, tidal power is predictable. Additionally, the project is so large that it can supply around 5% of Britains electricity every year. But environmentalists are opposed to i

44、t on the grounds that the barrages may interfere with the birds and fish stock near the river Severn. Meanwhile, the project will require too much taxpayers money and it operates at a higher cost compared with wind power. Where will the project go? The government may well approve it considering crea

45、ting more job opportunities. And at that time, it will be a long-lasting monument for tidal power.Extended Exercises1. fish or cut bait2. fishing for a compliment.3. fishing in troubled waters 4. other fish to fry 5. fish out of water 6. red herring7. living in a fishbowl. 8.packed in like sardines.

46、 Appreciation and Recitation1. 休嫌它寒微貧賤, 天涯無處似家園。2.母親不是賴以依靠的人，而是使依靠成為不必要的人。3. 無論是國王還是農(nóng)夫，家庭和睦是最幸福的。4. 所有幸福的家庭都十分相似；而每個(gè)不幸的家庭各有各的不幸5.幸福的家庭，父母靠慈愛當(dāng)家，孩子也是出于對(duì)父母的愛而順從大人。6.你將擁有的家庭比你出身的那個(gè)家庭重要。7.讓孩子感到家庭是世界上最幸福的地方，這是以往有涵養(yǎng)的大人明智的做法。這種美妙的家庭情感，在我看來，和大人饋贈(zèng)給孩子們的那些精致的禮物一樣珍貴。8.無論何時(shí)何地家永遠(yuǎn)是向游子敞開大門的地方。Part III參考譯文 海洋開發(fā) 潮汐能和海

47、浪能：是行動(dòng)的時(shí)候了1在所有激動(dòng)人心的話語中，政府對(duì)可再生能源的論述卻只是只言片語。英國地理位置優(yōu)越，與其它歐洲國家相比，它享受著（或承受著）最多的風(fēng)和最大的海浪。潮汐能和海浪能的潛力巨大：2006年初碳信托基金會(huì)（Carbon Trust）提交的一份報(bào)告上說海浪能和潮汐能可以為英國提供20的電能。碳信托基金會(huì)由英國政府設(shè)立，其任務(wù)是幫助政府減少溫室氣體排放。這份報(bào)告中給出的數(shù)字比之前估計(jì)的數(shù)字高出四倍多，這表明僅僅依靠海洋提供的能量就可以幫助英國達(dá)到溫室氣體減排的目標(biāo)。與此同時(shí)，據(jù)隸屬于美國國家能源部的國家可再生能源實(shí)驗(yàn)室（NREL）估測(cè)，東海岸地區(qū)海浪能潛力巨大，提供的能源超出整個(gè)大平原地

48、區(qū)全部風(fēng)力發(fā)電潛能的10至25倍以上。2.然而，（不論你是否相信，根據(jù)近年已知數(shù)據(jù)）2005年英國能源消費(fèi)中僅有2%來自再生能源（大部分是風(fēng)能），遠(yuǎn)低于歐洲平均水平6.7%，更無法與丹麥的16.2%和瑞典的29.8%相提并論。環(huán)保人士摩拳擦掌應(yīng)對(duì)一項(xiàng)雄心勃勃的潮汐發(fā)電計(jì)劃3僅一個(gè)項(xiàng)目就可以大大提高潮汐能的使用率。塞文河（Severn）是英國最長的河流，源出威爾士（Wales），注入大西洋布里斯托爾海峽（Bristol Channel），潮差達(dá)15米，位居世界第二。長期以來，工程師一直夢(mèng)想利用潮汐能。而且隨著氣候變化以及能源安全導(dǎo)致的政治問題，部長們現(xiàn)在也對(duì)潮汐能利用重視起來。2006年1月26

49、日，政府發(fā)布了可能新建項(xiàng)目的名單，其中包括三個(gè)大壩（實(shí)際上就是大型水壩）和兩個(gè)潮湖（就是在海里建設(shè)的人工水庫，隨著潮水的漲落蓄積海水）。4很顯然，這些規(guī)劃項(xiàng)目有其吸引力。潮汐是一種最有規(guī)律的可再生能源，不像風(fēng)能、波能（還有主要靠降雨獲得能源的水電），潮汐受天體力學(xué)的固定變化規(guī)律控制，是可以預(yù)測(cè)的。這些規(guī)劃的新建項(xiàng)目，有些非常龐大，令人咂舌。最大的項(xiàng)目是從濱海韋斯頓到卡迪夫的大壩，該大壩長10英里，預(yù)計(jì)耗資220億英鎊。當(dāng)潮水流動(dòng)速度最快時(shí)，該大壩的發(fā)電量可達(dá)860萬千瓦，這相當(dāng)于英國高峰耗電量的七分之一，比其它所有可再生能源所發(fā)電量的總和都多。雖然平均發(fā)電量比高峰時(shí)期低得多，但仍可滿足英國每年

50、5%的電力需求。5該項(xiàng)目可大大降低英國二氧化碳的排放量，但關(guān)心當(dāng)?shù)丨h(huán)境的綠色環(huán)保主義者對(duì)此并不以為然。塞文河口是鳥類的棲息地，而大型水壩會(huì)在很大程度上破壞或毀掉河口，這同樣也會(huì)破壞河流中魚群的生態(tài)環(huán)境。作為一個(gè)環(huán)保團(tuán)體，全球之友認(rèn)為，海上潮湖可能會(huì)為解決這些問題提供有效辦法。6.從經(jīng)濟(jì)的角度出發(fā)也有一些人對(duì)該項(xiàng)目表示反對(duì)，部長們承認(rèn)提案中規(guī)模最大的議案需要向納稅人融資。前沿經(jīng)濟(jì)學(xué)咨詢公司 (Frontier Economics) 的一份報(bào)告認(rèn)為，可通過其它技術(shù)，比如風(fēng)力渦輪機(jī)，來獲得同等可再生能源能量。大壩可能影響布里斯托爾海峽的船運(yùn)。甚至有些人只是覺得大壩有礙觀瞻而持反對(duì)意見。7.啟動(dòng)哪個(gè)項(xiàng)

51、目、何時(shí)動(dòng)工，這些至少在一年以后才能確定。保守黨（項(xiàng)目進(jìn)行期間可能是保守黨執(zhí)政）表示他們對(duì)此并不反對(duì)。即使項(xiàng)目能開工，也得在2020年以后才能完成。8.政治家們對(duì)這個(gè)項(xiàng)目的支持當(dāng)然還別有他意，正如美國在大蕭條期間建設(shè)的胡佛大壩，英國政府稱塞文河大壩可提供大量的就業(yè)機(jī)會(huì)，并為公司提供大量的工程建設(shè)項(xiàng)目。作為世界上最大的工程項(xiàng)目之一，塞文河大壩必然會(huì)是一座不朽的豐碑，這是無論哪個(gè)政治家都會(huì)批準(zhǔn)的?；ɡ藶殡娏?.多少年來，海浪能利用的前景始終沉浮不定。但如今技術(shù)正在這方面不斷取得進(jìn)展。今年夏天,世界上第一座海浪發(fā)電廠將要在葡萄牙開始投入運(yùn)作并接入電網(wǎng)。技術(shù)進(jìn)步還體現(xiàn)在一種新型海浪能發(fā)動(dòng)機(jī)上,它可以

52、極大地降低從海洋獲取能源的成本。10 既然潛力如此巨大，那么為何迄今為止無任何一臺(tái)商用海浪能發(fā)電機(jī)投入使用？“最大的問題在于海浪發(fā)電機(jī)的價(jià)格相對(duì)比較昂貴，”位于英格蘭布萊思的新能源和可再生能源中心的基思梅爾頓這樣說道。利用海浪發(fā)電的成本大多介于每千瓦時(shí)（KWh）10至20便士（折合18至36美分），而天然氣發(fā)電的成本大約是每千瓦時(shí)4便士（4p/KWh）。海浪發(fā)電的成本如此昂貴的一個(gè)原因是，全部設(shè)備必須采取防風(fēng)暴、防腐蝕的設(shè)計(jì)。幾十年來，有關(guān)利用波浪能的設(shè)想比比皆是、數(shù)不勝數(shù)，而大多數(shù)設(shè)計(jì)方案都添加了過多的改進(jìn)，其目的就是為了減少機(jī)器在海里發(fā)生故障的可能。這些改進(jìn)降低了機(jī)器工作的效率、增加了每千

53、瓦時(shí)的成本，還使得海浪發(fā)電技術(shù)停滯不前。11.但是，事情現(xiàn)在似乎出現(xiàn)了轉(zhuǎn)機(jī)。據(jù)英國海洋動(dòng)力傳送公司的安德魯斯科特稱，在靠近葡萄牙北海岸的瓦爾津附近，有三根長150米蛇形浮筒，被稱為“海蛇號(hào)”的海浪能轉(zhuǎn)換器正翹首以待，準(zhǔn)備接入國家電網(wǎng)。英國海洋動(dòng)力傳送公司是“海蛇號(hào)”的制造商。每根浮筒沿其長度都裝有三個(gè)動(dòng)力轉(zhuǎn)換模塊，這些模塊將浮筒銜接處不斷牽動(dòng)搖擺產(chǎn)生的動(dòng)能轉(zhuǎn)變?yōu)殡娔?，這就像蛇受到海浪拍打而扭動(dòng)一樣。這三條“蛇”是建立一座擁有24兆瓦特發(fā)電量的海浪能發(fā)電廠的第一步，屆時(shí)該發(fā)電廠能夠?yàn)?5000戶家庭供電。“海蛇號(hào)”鋪設(shè)在平靜海面上。這種設(shè)計(jì)是更高效的模式，從而避免了彈性和效率不可兼顧的矛盾。12

54、.不過一臺(tái)被稱作“笛鯛”的新裝置能夠進(jìn)一步提高其工作效率。埃得斯普納認(rèn)為，當(dāng)對(duì)一臺(tái)高速運(yùn)轉(zhuǎn)的發(fā)電機(jī)施加一個(gè)很小的作用力時(shí)，往往會(huì)把發(fā)電機(jī)的效率最大地發(fā)揮出來而海浪提供的外力則恰恰相反。笛鯛”的發(fā)明人，基地設(shè)在英國達(dá)勒姆附近的顧問工程師如是說。他發(fā)明的裝置運(yùn)轉(zhuǎn)起來就像一臺(tái)典型的直線發(fā)動(dòng)機(jī)。在裝置內(nèi)，磁鐵在線圈內(nèi)上下移動(dòng)從而產(chǎn)生電流。但和典型發(fā)動(dòng)機(jī)的一個(gè)重大的區(qū)別是：沿線圈旁放置了另一塊同線圈內(nèi)那塊磁極相反的磁鐵。這樣可以避免線圈中央的磁鐵上下移動(dòng)的幅度過小。否則，磁力會(huì)不斷阻止磁鐵的運(yùn)動(dòng)，這樣磁鐵的運(yùn)動(dòng)便會(huì)時(shí)斷時(shí)續(xù)。其結(jié)果會(huì)導(dǎo)致磁鐵以一系列短促、快速的方式運(yùn)動(dòng)，這種運(yùn)動(dòng)比起緩慢、小幅的運(yùn)動(dòng)更有利

55、于發(fā)電。早期的測(cè)試表明，這種裝置的效率有可能達(dá)到現(xiàn)存海浪能發(fā)電機(jī)工作效率的十倍以上。人們已經(jīng)在海水中苦苦尋覓了這么多年，海浪是否能夠最終濺起一絲靈光呢？ Unit 6 Text B Part IUnderstanding and LearningBackground Information1. Seismic Survey :An exploration method in which strong low-frequency sound waves are generated on the surface or in the water to find subsurface rock str

56、uctures that may contain hydrocarbons.The sound waves travel through the layers of the earths crust; however, at formation boundaries some of the waves are reflected back to the surface where sensitive detectors pick them up.Reflections from shallow formations arrive at the surface sooner than refle

57、ctions from deep formations, and since the reflections are recorded, a record of the depth and configuration of the various formations can be generated. Interpretation of the record can reveal possible hydrocarbon-bearing formations, which indicate natural gas and petroleum deposits. 2.在網(wǎng)上找的這個(gè)背景知識(shí)放在這里行不？和課文中提到的wide-azimuth survey 是不是一回事？缺乏專業(yè)知識(shí)??！ Wide-Azimuth Marine Acquisition Illuminating