雅思詞匯例句

7000個(gè)雅思詞匯100套真題中提煉出的100百個(gè)經(jīng)典句子，包涵了7000個(gè)雅思詞匯。TypicalofthegrasslanddwellersofthecontinentistheAmericanantelope,orpronghorn.1美洲羚羊，或稱(chēng)叉角羚，是該大陸典型的草原動(dòng)物。OfthemillionswhosawHaley'scometin1986,howmanypeoplewilllivelongenoughtoseeitreturninthetwenty-firstcentury.1986年看見(jiàn)哈雷慧星的千百萬(wàn)人當(dāng)中，有多少人能夠長(zhǎng)壽到足以目睹它在二十一世紀(jì)的回歸呢？Anthropologistshavediscoveredthatfear,happiness,sadness,andsurpriseareuniversallyreflectedinfacialexpressions.3.人類(lèi)學(xué)家們已經(jīng)發(fā)現(xiàn)，恐懼，快樂(lè)，悲傷和驚奇都會(huì)行之于色，這在全人類(lèi)是共通的。Becauseofitsirritatingeffectonhumans,theuseofphenolasageneralantiseptichasbeenlargelydiscontinued.4.由于苯酚對(duì)人體帶有刺激性作用，它基本上已不再被當(dāng)作常用的防腐劑了。Ingrouptoremaininexistence,aprofit-makingorganizationmust,inthelongrun,producesomethingconsumersconsiderusefulordesirable.任何盈利組織若要生存， 最終都必須生產(chǎn)出消費(fèi)者可用或需要的產(chǎn)品。Thegreaterthepopulationthereisinalocality;thegreatertheneedthereisforwater,transportation,anddisposalofrefuse.一個(gè)地方的人口越多，其對(duì)水，交通和垃圾處理的需求就會(huì)越大。Itismoredifficulttowritesimply,directly,andeffectivelythantoemployflowerybutvagueexpressionsthatonlyobscureone’smeaning.簡(jiǎn)明，直接，有力的寫(xiě)作難于花哨，含混而意義模糊的表達(dá)。Withmodernofficesbecomingmoremechanized,designersareattemptingtopersonalizethemwithwarmer,lesssevereinteriors.隨著現(xiàn)代辦公室的日益自動(dòng)化， 設(shè)計(jì)師們正試圖利用較為溫暖而不太嚴(yán)肅的內(nèi)部裝飾來(lái)使其具有親切感。Thedifferencebetweenlibelandslanderisthatlibelisprintedwhileslanderisspoken.誹謗和流言的區(qū)別在于前者是書(shū)面的，而后者是口頭的。Thekneeisthejointswherethethighbonemeetsthelargeboneofthelowerleg.10.膝蓋是大腿骨和小腿脛的連接處。Acidsarechemicalcompoundsthat,inwatersolution,haveasharptaste,acorrosiveactiononmetals,andtheabilitytoturncertainbluevegetabledyesred.11.酸是一種化合物，它在溶于水時(shí)具有強(qiáng)烈的氣味和對(duì)金屬的腐蝕性，并且能夠使某些藍(lán)色植物染料變紅。BillieHoliday’sreputationasagreatjazz-bluessingerrestsonherabilitytogiveemotionaldepthtohersongs.BillieHoliday's作為一個(gè)爵士布魯斯樂(lè)杰出歌手的名聲建立在能夠賦予歌曲感情深度的能力。Essentially,atheoryisanabstract,symbolicrepresentationofwhatisconceivedtobereality.13.理論在本質(zhì)上是對(duì)認(rèn)識(shí)了的現(xiàn)實(shí)的一種抽象和符號(hào)化的表達(dá)。Longbeforechildrenareabletospeakorunderstandalanguage,theycommunicatethroughfacialexpressionsandbymakingnoises.14.兒童在能說(shuō)或能聽(tīng)懂語(yǔ)言之前，很久就會(huì)通過(guò)面部表情和靠發(fā)出噪聲來(lái)與人交流了。Thankstomodernirrigation,cropsnowgrowabundantlyinareaswhereoncenothingbutcactiandsagebrushcouldlive.受當(dāng)代灌溉 （技術(shù)設(shè)施）之賜，農(nóng)作物在原來(lái)只有仙人掌和蕎屬科植物才能生存的地方旺盛的生長(zhǎng)。Thedevelopmentofmechanicaltimepiecesspurredthesearchformoreaccuratesundialswithwhichtoregulatethem.16.機(jī)械計(jì)時(shí)器的發(fā)展促使人們尋求更精確的日晷，以便校準(zhǔn)機(jī)械計(jì)時(shí)器。Anthropologyisascienceinthatanthropologistsusearigoroussetofmethodsandtechniquestodocumentobservationsthatcanbecheckedbyothers.17.人類(lèi)學(xué)是一門(mén)科學(xué)，因?yàn)槿祟?lèi)學(xué)家采用一整套強(qiáng)有力的方法和技術(shù)來(lái)記錄觀測(cè)結(jié)果，而這樣記錄下來(lái)的觀測(cè)結(jié)果是供他人核查的。Fungiareimportantintheprocessofdecay,whichreturnsingredientstothesoil,enhancessoilfertility,anddecomposesanimaldebris.18.真菌在腐化過(guò)程中十分重要，而腐化過(guò)程將化學(xué)物質(zhì)回饋于土壤，提高其肥力，并分解動(dòng)物糞便。Whenitisstruck,atuningforkproducesanalmostpuretone,retainingitspitchoveralongperiodoftime.19.音叉被敲擊時(shí)，產(chǎn)生幾乎純質(zhì)的音調(diào)，其音量經(jīng)久不衰。AlthoughpecansaremostplentifulinthesoutheasternpartoftheUnitedStates,theyarefoundasfarnorthasOhioandIllinois.雖然美洲山河桃樹(shù)最集中于美國(guó)的東南部但是在北至俄亥俄州及伊利諾州也能看見(jiàn)它們。Eliminatingproblemsbytransferringtheblametoothersisoftencalledscape-goating.21.用怪罪別人的辦法來(lái)解決問(wèn)題通常被稱(chēng)為尋找替罪羊。Thechieffoodseateninanycountrydependlargelyonwhatgrowsbestinitsclimateandsoil.一個(gè)國(guó)家的主要食物是什么，大體取決于什么作物在其天氣和土壤條件下生長(zhǎng)得最好。Overaverylargenumberoftrials,theprobabilityofanevent’soccurringisequaltotheprobabilitythatitwillnotoccur.在大量的實(shí)驗(yàn)中，某一事件發(fā)生的幾率等于它不發(fā)生的幾率。Mostsubstancecontractwhentheyfreezesothatthedensityofasubstance’ssolidishigherthanthedensityofitsliquid.大多數(shù)物質(zhì)遇冷收縮，所以他們的密度在固態(tài)時(shí)高于液態(tài)。Themechanismbywhichbraincellsstorememoriesisnotclearlyunderstood.大腦細(xì)胞儲(chǔ)存記憶的機(jī)理并不為人明白。Bythemiddleofthetwentiethcentury,paintersandsculptorsintheUnitedStateshadbeguntoexertagreatworldwideinfluenceoverart.到了二十一世紀(jì)中葉，美國(guó)畫(huà)家和雕塑家開(kāi)始在世界范圍內(nèi)對(duì)藝術(shù)產(chǎn)生重大影響。IntheeasternpartofNewJerseyliesthecityofElizabeth,amajorshippingandmanufacturingcenter.伊麗莎白市，一個(gè)重要的航運(yùn)和制造業(yè)中心，坐落于新澤西州的東部。ElizabethBlackwell,thefirstwomanmedicaldoctorintheUnitedStates,foundedtheNewYorkInfirmary,aninstitutionthathasalwayshadacompletelyfemalemedicalstaff.ElizabethBlackwell，美國(guó)第一個(gè)女醫(yī)生， 創(chuàng)建了員工一直為女性紐約診所。AlexanderGrahamBelloncetoldhisfamilythathewouldratherberememberedasateacherofthedeafthanastheinventorofthetelephone.AlexanderGrahamBell曾告訴家人， 他更愿意讓后人記住他是聾子的老師，而非電話的發(fā)明者。Becauseitsleavesremaingreenlongafterbeingpicked,rosemarybecameassociatedwiththeideaofremembrance.采摘下的迷迭香樹(shù)葉常綠不衰，因此人們把迷迭香樹(shù)與懷念聯(lián)系在一起。Althoughapparentlyrigid,bonesexhibitadegreeofelasticitythatenablestheskeletontowithstandconsiderableimpact.31.骨頭看起來(lái)是脆硬的，但它也有一定的彈性，使得骨骼能夠承受相當(dāng)?shù)拇驌簟hatxenoncouldnotFORMchemicalcompoundswasoncebelievedbyscientists.科學(xué)家曾相信：氙氣是不能形成化合物的。Researchintothedynamicsofstormsisdirectedtowardimprovingtheabilitytopredicttheseeventsandthustominimizedamageandavoidlossoflife.對(duì)風(fēng)暴動(dòng)力學(xué)的研究是為了提高風(fēng)暴預(yù)測(cè)從而減少損失，避免人員傷亡。Theeliminationofinflationwouldensurethattheamountofmoneyusedinrepayingaloanwouldhavethesamevalueastheamountofmoneyborrowed.消除通貨膨脹應(yīng)確保還貸的錢(qián)應(yīng)與所貸款的價(jià)值相同。Futurism,anearlytwentieth-centurymovementinart,rejectedalltraditionsandattemptedtoglorifycontemporarylifebyemphasizingthemachineandmotion.未來(lái)主義，二十世紀(jì)早期的一個(gè)藝術(shù)思潮。拒絕一切傳統(tǒng)，試圖通過(guò)強(qiáng)調(diào)機(jī)械和動(dòng)態(tài)來(lái)美化生活。OneofthewildestandmostinaccessiblepartsoftheUnitedStatesistheEvergladeswherewildlifeisabundantandlargelyprotected.Everglades是美國(guó)境內(nèi)最為荒涼和人跡罕至的地區(qū)之一，此處有大量的野生動(dòng)植物而且大多受 （法律 ）保護(hù)。LucretiaMott’sinfluencewassosignificantthatshehasbeencreditedbysomeauthoritiesastheoriginatoroffeminismintheUnitedStates.LucretiaMott's的影響巨大，所以一些權(quán)威部門(mén)認(rèn)定她為美國(guó)女權(quán)運(yùn)動(dòng)的創(chuàng)始人。Theactivitiesoftheinternationalmarketingresearcherarefrequentlymuchbroaderthanthoseofthedomesticmarketer.國(guó)際市場(chǎng)研究者的活動(dòng)范圍常常較國(guó)內(nèi)市場(chǎng)研究者廣闊。ThecontinentaldividereferstoanimaginarylineintheNorthAmericanRockiesthatdividesthewatersflowingintotheAtlanticOceanfromthoseflowingintothePacific.大陸分水嶺是指北美洛磯山脈上的一道想象線，該線把大西洋流域和太平洋流域區(qū)分開(kāi)來(lái)。StudiesofthegravityfieldoftheEarthindicatethatitscrustandmantleyieldwhenunusualweightisplacedonthem.對(duì)地球引力的研究表明，在不尋常的負(fù)荷之下地殼和地幔會(huì)發(fā)生位移。TheannualworthofUtah’smanufacturingisgreaterthanthatofitsminingandfarmingcombined.41.尤它州制造業(yè)的年產(chǎn)值大于其工業(yè)和農(nóng)業(yè)的總和。Thewallflowerissocalledbecauseitsweakstemsoftengrowonwallsandalongstonycliffsforsupport.墻花之所以叫墻花，是因?yàn)槠浯嗳醯闹Ω山?jīng)常要靠墻壁或順石崖生長(zhǎng)，以便有所依附。Itistheinteractionbetweenpeople,ratherthantheeventsthatoccurintheirlives,thatisthemainfocusofsocialpsychology.社會(huì)心理學(xué)的主要焦點(diǎn)是人與人之間的交往，而不是他們各自生活中的事件。enthusiasmmoreNosocialcrusadearousedElizabethWilliamsthantheexpansionofeducationalfacilitiesforimmigrantstotheenthusiasmmoreUnitedStates.給美國(guó)的新移民增加教育設(shè)施比任何社會(huì)運(yùn)動(dòng)都更多的激發(fā)了ElizabethWilliams的熱情。Quailstypicallyhaveshortroundedwingsthatenablethemtospringintofullflightinstantlywhendisturbedintheirhidingplaces.典型的鵪鶉都長(zhǎng)有短而圓的翅膀，憑此他們可以在受驚時(shí)一躍而起，飛離它們的躲藏地。Accordingtoanthropologists,theearliestancestorsofhumansthatstooduprightresembledchimpanzeesfacially,withslopingforeheadsandprotrudingbrows.根據(jù)人類(lèi)學(xué)家的說(shuō)法，直立行走的人的鼻祖面部輪廓與黑猩猩相似，額頭后傾，眉毛突出。Notuntil1866wasthefullysuccessfultransatlanticcablefinallylaid.直到1866年第一條橫跨大西洋的電纜才完全成功的架通。Inhiswriting,JohnCroweRansomdescribeswhatheconsidersthespiritualbarrennessofsocietybroughtaboutbyscienceandtechnology.JohnCroweRansom在他的著作中描述了他認(rèn)為是由科學(xué)技術(shù)給社會(huì)帶來(lái)的精神貧困。Childrenwithparentswhoseguidanceisfirm,consistent,andrationalareinclinedtopossesshighlevelsofself-confidence.父母的教導(dǎo)如果堅(jiān)定， 始終如一和理性， 孩子就有可能充滿(mǎn)自信。TheancientHopewellpeopleofNorthAmericaprobablycultivatedcornandothercrops,buthuntingandgatheringwerestillofcriticalimportanceintheireconomy.北美遠(yuǎn)古的 Hopewell人很可能種植了玉米和其他農(nóng)作物，但打獵和采集對(duì)他們的經(jīng)濟(jì)貿(mào)易仍是至關(guān)重要的。Usingmanysymbolsmakesitpossibletoputalargeamountofinformationonasinglemap.51.使用多種多樣的符號(hào)可以在一張地圖里放進(jìn)大量的信息。Anarchismisatermdescribingaclusterofdoctrinesandattitudeswhoseprincipalunitingfeatureisthebeliefthatgovernmentisbothharmfulandunnecessary.無(wú)政府主義這個(gè)詞描述的是一堆理論和態(tài)度，它們的主要共同點(diǎn)在于相信政府是有害的，沒(méi)有必要的。ProbablynomanhadmoreeffectonthedailylivesofmostpeopleintheUntiedStatesthandidHenryFordapioneerinautomobileproduction.恐怕沒(méi)有誰(shuí)對(duì)大多數(shù)美國(guó)人的日常生活影響能超過(guò)汽車(chē)生產(chǎn)的先驅(qū)亨利 .福特。Theuseofwell-chosennonsensewordsmakespossiblethetestingofmanybasichypothesesinthefieldoflanguagelearning.使用精心挑選的無(wú)意義詞匯，可以檢驗(yàn)語(yǔ)言學(xué)科里許多基本的假定。Thehistoryofpaintingisafascinatingchainofeventsthatprobablybeganwiththeveryfirstpicturesevermade.優(yōu)化歷史是由一連串的迷人事件組成，其源頭大概可以上溯到最早的圖畫(huà)。Perfectlymatchedpearls,strungintoanecklace,bringafarhigherpricethanthesamepearlstoldindividually.相互般配的珍珠，串成一條項(xiàng)鏈，就能賣(mài)到比單獨(dú)售出好得多的價(jià)錢(qián)。Duringtheeighteenthcentury,LittleTurtlewaschiefoftheMiamitribewhoseterritorybecamewhatisnowIndianaandOhio.十八世紀(jì)時(shí)，“小烏龜”是邁阿密部落的酋長(zhǎng)，該部落的地盤(pán)就是今天的印第安那州和俄亥俄州。Amongalmostsevenhundredspeciesofbamboo,somearefullygrownatlessthanafoothigh,whileotherscangrowthreefeetintwenty-fourhours.在竹子的近七百個(gè)品種中，有的全長(zhǎng)成還不到一英尺，有的卻能在二十四小時(shí)內(nèi)長(zhǎng)出三英尺。Beforestaringonaseavoyage,prudentnavigatorslearntheseacharts,studythesailingdirections,andmemorizelighthouselocationstopreparethemselvesforanyconditionstheymightencounter.謹(jǐn)慎的航海員在出航前，會(huì)研究航向，記錄的燈塔的位置，以便對(duì)各種可能出現(xiàn)的情況做到有備無(wú)患。Ofalltheeconomicallyimportantplants,palmshavebeentheleaststudied.在所有的經(jīng)濟(jì)作物中，棕櫚樹(shù)得到的研究最少。Buyersandsellersshouldbeawareofnewdevelopmentsintechnologycananddoesaffectmarketingactivities.61.購(gòu)買(mǎi)者和銷(xiāo)售者都應(yīng)該留意技術(shù)的新發(fā)展，原因很簡(jiǎn)單，因?yàn)榧夹g(shù)能夠并且已經(jīng)影響著營(yíng)銷(xiāo)活動(dòng)。Theapplicationofelectroniccontrolsmadepossiblebythemicroprocessorandcomputerstoragehavemultipliedtheusesofthemoderntypewriter.電腦儲(chǔ)存和由于電子微處理機(jī)得以實(shí)現(xiàn)的電控運(yùn)用成倍的增加了現(xiàn)代打字機(jī)的功能。Thehumanskeletonconsistsofmorethantwohundredbonesboundtogetherbytoughandrelativelyinelasticconnectivetissuescalledligaments.人類(lèi)骨骼有二百多塊骨頭組成，住些骨頭石油堅(jiān)韌而相對(duì)缺乏彈性的，被稱(chēng)為韌帶的結(jié)蒂組連在一起。Thepigmentationofapearlisinfluencedbythetypeofoysterinwhichitdevelopsandbythedepth,temperature,andthesaltcontentofthewaterinwhichtheoysterlives.珍珠的色澤受到作為其母體牡蠣種類(lèi)及牡蠣生活水域的深度，溫度和含鹽度的制約。Althoughmockingbirdssuperblymimicthesongsandcallsofmanybirds,theycannonethelessbequicklyidentifiedasmockingbirdsbycertainauralclues.盡管模仿鳥(niǎo)學(xué)很多種鳥(niǎo)的鳴叫聲惟妙惟肖，但人類(lèi)還是能夠依其聲音上的線索很快識(shí)別它們。Notonlycanwalkingfishliveoutofwater,buttheycanalsotravelshortdistancesoverland.鲇魚(yú)不僅可以離開(kāi)水存活，還可以在岸上短距離移動(dòng)。Scientistsdonotknowwhydinosaursbecameextinct,butsometheoriespostulatethatchangersingeography,climate,andsealevelswereresponsible.科學(xué)家不知道恐龍為何絕種了，但是一些理論推斷是地理，氣候和海平面的變化造成的。Thescienceofhorticulture,inwhichtheprimaryconcernsaremaximumyieldandsuperiorquality,utilizesinFORMationderivedfromothersciences.主要目的在于豐富和優(yōu)質(zhì)的農(nóng)藝學(xué)利用了其他科學(xué)的知識(shí)。Snowaidsfarmersbykeepingheartinthelowergroundlevels,therebysavingtheseedsfromfreezing.69.雪對(duì)農(nóng)民是一種幫助，因?yàn)樗３值貙油寥赖臏囟?，使種子不致凍死。Eventhoughtheprecisequalitiesofheroinliterarywordsmayvaryovertime,thebasicexemplaryfunctionoftheheroseemstoremainconstant.歷代文學(xué)作品中的英雄本色雖各有千秋，但其昭世功力卻是恒古不變的。Peopleinprehistorictimescreatedpaintsbygrindingmaterialssuchasplantsandclayintopowerandthenaddingwater.71.史前的人們制造顏料是將植物和泥土等原料磨成粉末，然后加水。Oftenveryannoyingweeds,goldenrodscrowdoutlesshardyplantsandactashoststomanyinsectpests.黃菊花通常令人生厭，它擠走不那么頑強(qiáng)的植物，并找來(lái)很多害蟲(chóng)。Startingaround7000B.C.,andforthenextfourthousandyears,muchoftheNorthernHemisphereexperiencedtemperatureswarmerthanatpresent.大約從公元前七千年開(kāi)始，在四千年當(dāng)中，北半球的溫度比現(xiàn)在與高。WhenHenryFordfirstsoughtfinancialbackingformakingcars,theverynotionoffarmersandclerksowningautomobileswasconsideredridiculous.當(dāng)亨利.福特最初制造汽車(chē)為尋求資金支持時(shí)，農(nóng)民和一般職員也能擁有汽車(chē)的想法被認(rèn)為是可笑的。Thoughoncequitelarge,thepopulationofthebaldeagleacrossNorthAmericahasdrasticallydeclinedinthepastfortyyears.北美禿頭鷹的數(shù)量一度很多，但在近四十年中全北美的禿頭鷹數(shù)量急劇下降。Thebeaverchewsdowntreestogetfoodandmaterialwithwhichtobuilditshome.水獺啃倒樹(shù)木，以便取食物并獲得造窩的材料。Poodleswereonceusedasretrieversinduckhunting,buttheAmericanKennelClubdoesnotconsiderthemsportingdogsbecausetheyarenowprimarilykeptaspets.長(zhǎng)卷毛狗曾被用作獵鴨時(shí)叼回獵物的獵犬， 但是美國(guó) KennelClub卻不承認(rèn)它們?yōu)楂C犬，因?yàn)樗鼈儸F(xiàn)在大多數(shù)作為寵物飼養(yǎng)。Asaresultofwhatisnowknowinphysicsandchemistry,scientistshavebeenabletomakeimportantdiscoveriesinbiologyandmedicine.物理學(xué)和化學(xué)的一個(gè)成果是使得科學(xué)家們能在生物學(xué)和醫(yī)學(xué)上獲得重大發(fā)現(xiàn)。ThepracticeofmakingexcellentfilmsbasedonratherobscurenovelshasbeengoingonsolongintheUnitedStatesastoconstituteatradition.根據(jù)默默無(wú)聞的小說(shuō)制作優(yōu)秀影片在美國(guó)由來(lái)已久，已經(jīng)成為傳統(tǒng)。Sincetheconsumerconsidersthebestfruittobethatwhichisthemostattractive,thegrowermustprovideproductsthatsatisfythediscerningeye.因?yàn)轭櫩驼J(rèn)為最好的水果應(yīng)該看起來(lái)也是最漂亮的，所以種植者必須提供能滿(mǎn)足挑剔眼光的產(chǎn)品。Televisionthemostpervasiveandpersuasiveofmoderntechnologies,markedbyrapidchangeandgrowth,ismovingintoanewera,aneraofextraordinarysophisticationandversatility,whichpromisestoreshapeourlivesandourworld.81.電視，這項(xiàng)從迅速變化和成長(zhǎng)為標(biāo)志的最普及和最有影響力的現(xiàn)代技術(shù)，正在步入一個(gè)新時(shí)代，一個(gè)極為成熟和多樣化的時(shí)代，這將重塑我們的生活和世界。WilliamRaineyHarperluredhimtothenewuniversityofChicago,whereheremainedofficiallyforexactlyagenerationandwherehisstudentsinadvancedcompositionfoundhimterrifyinglyfrigidintheclassroombutsympatheticandunderstandingintheirpersonalconferences.他的教書(shū)生涯始于麻省理工學(xué)院， 但是WilliamRaineyHarper把他吸引到了新成立的芝加哥大學(xué)。 他在那里正式任職長(zhǎng)達(dá)整整一代人的時(shí)間。他的高級(jí)作文課上的學(xué)生覺(jué)得他在課上古板得可怕， 但私下交流卻富有同情和理解。Theslothpayssuchlittleattentiontoitspersonalhygienethatgreenalgaegrowonitscoarsehairandcommunitiesofaparasiticmothliveinthedepthsofitscoatproducingcaterpillarswhichgrazeonitsmouldyhair.Itsmusclesaresuchthatitisquitsincapableofmovingataspeedofoverakilometeranhourevenovertheshortestdistancesandtheswiftestmovementitcanmakeisasweepofitshookedarm.樹(shù)獺即不講究衛(wèi)生，以至于它粗糙的毛發(fā)上生出綠苔，成群的寄生蛾生長(zhǎng)在它的皮毛深處，變成毛毛蟲(chóng)，并以它的臟毛為食。她的肌肉不能讓他哪怕在很短的距離以?xún)?nèi)以每小時(shí)一公里的速度移動(dòng)。 它能做的最敏捷的動(dòng)作就是揮一揮它彎曲的胳膊。Artificialflowersareusedforscientificaswellasfordecorativepurposes.Theyaremadefromavarietyofmaterials,suchaswayandglass,soskillfullythattheycanscarcelybedistinguishedfromnaturalflowers.人造花卉即可用于科學(xué)目的，也可用于裝飾目的，它們可以用各種各樣的材料制成，臂如蠟和玻璃；其制作如此精巧，幾乎可以以假亂真。ThreeyearsofresearchatanabandonedcoalmineinArgonne,Illinois,haveresultedinfindingsthatscientistsbelievecanhelpreclaimthousandsofminedisposalsitesthatscarthecoal-richregionsoftheUnitedStates.在伊利諾州 Angonne市的一個(gè)廢棄煤礦的三年研究取得了成果，科學(xué)家們相信這些成果可以幫助改造把美國(guó)產(chǎn)煤區(qū)弄得傷痕累累的數(shù)千個(gè)舊煤場(chǎng)。Whenthepersuadingandtheplanningforthewesternrailroadshadfinallybeencompleted,thereallychallengingtaskremained:thedangerous,sweaty,backbreaking,brawlingbusinessofactuallybuildingthelines.當(dāng)有關(guān)西部鐵路的說(shuō)服和規(guī)劃工作終于完成后，真正艱難的任務(wù)還沒(méi)有開(kāi)始；即危險(xiǎn)，吃力，需要傷筋動(dòng)骨和吵吵嚷嚷的建造這些鐵路的實(shí)際工作。Becauseofthespacecrunch,theArtMuseumhasbecomeincreasinglycautiousinconsideringacquisitionsanddonationsofart,insomecasespassingupopportunitiestostrengtheniscollections.由于空間不足，藝術(shù)博物館在考慮購(gòu)買(mǎi)和接受捐贈(zèng)的藝術(shù)品是越來(lái)越慎重，有些情況下放棄其進(jìn)一步改善收藏的機(jī)會(huì)。TheUnitedStatesConstitutionrequiresthatPresidentbeanatural-borncitizen,thirty-fiveyearsofageorolder,whohaslivedintheUnitedStatesforaminimumoffourteenyears.美國(guó)憲法要求總統(tǒng)是生于美國(guó)本土的公民，三十五歲以上，并且在美國(guó)居住了至少十四年。AridregionsinthesouthwesternUnitedStateshavebecomeincreasinglyinvitingplaygroundsforthegrowingnumberofrecreationseekerswhoownvehiclessuchasmotorcyclesorpoweredtrailbikesandindulgeinhill-climbingcontestsorincavingnewtrailsinthedesert.91.美國(guó)西部的不毛之地正成為玩耍的地方，對(duì)越來(lái)越多擁有摩托車(chē)或越野單車(chē)類(lèi)車(chē)輛的， 喜歡放縱于爬坡比賽或開(kāi)辟新的沙漠通道的尋歡作樂(lè)者具有不斷增長(zhǎng)的吸引力。Stonedoesdecay,andsotoolsoflongagohaveremainedwheneventhebonesofthemanwhomadethemhavedisappearedwithouttrace.石頭不會(huì)腐爛， 所以以前的 （石器）工具能保存下來(lái)， 雖然它們的制造者已經(jīng)消失的無(wú)影無(wú)蹤。Insectswouldmakeitimpossibleforustoliveintheworld;theywoulddevourallourcropsandkillourflocksandherds,ifitwerenotfortheprotectionwegetfrominsect-eatinganimals.昆蟲(chóng)就將會(huì)使我們無(wú)法在這個(gè)世界上居住；如果我們沒(méi)有受到以昆蟲(chóng)為食的動(dòng)物的保護(hù)， 昆蟲(chóng)就會(huì)吞嚼掉我們所有的莊稼并殺死我們飼養(yǎng)的禽獸。Itistruethatduringtheirexplorationstheyoftenfaceddifficultiesanddangersofthemostperilousnature,equippedinamannerwhichwouldmakeamodernclimbershudderattheth