文章中间主体内容句型原因结果分析，另一原因在分析了基本原因之后再补充一个次要的或者更重要时用，三用于解释性和阐述性论说文，美洲羚羊或称叉角羚是该大陆典型的草原动物。
四六级作文经典句子
保证你四，六级作文110分以上！！！！！！！！！！！！！
ChapterOne文章开头句型
1-1对立法:先引出其他人的不同看法,然后提出自己的看法或者偏向于某一看法,
适用于有争议性的主题.
例如(e.g)
[1].Whenaskedabout.....,thevast/overwhelmingmajorityofpeoplesaythat.......ButIthink/viewabitdifferently.
[2].Whenitcomesto....,somepeoplebielivethat.......Othersargue/claimthatthe
opposite/ http://www.oh100.com (Itendtotheprofer/latter...)
[3].Now,itiscommonly/generally/widelybelieved/held/acknowledgedthat....Theyclaim/believe/arguethat...ButIwonder/doubtwhether.....
1-2现象法引出要剖析的现象或者问题,然后评论.
e.g
[1].Recentlytheriseinproblemof/(phenomenonof)...hascause/aroused
public/popular/wide/worldwideconcern.
[2].Recentlytheissueoftheproblemof/thephenomenonof...hasbeenbroughtintofocus.(hasbeenbrouthtopublicattention)
[3].Inflation/Corruption/Socialinequality...isyetanotherofthenewandbittertruthwehavetolearntofacenow/constantly.
-----Tobecontinued!!
1-3观点法----开门见山,直接了当地提出自己对要讨论的问题的看法.
e.g:
[1].Neverhistoryhasthechangeof..beenasevidentas...Nowhereintheworld/Chinahastheissue/ideaof..bennmorevisible/popularthan...
[2].Nowpeopleingrowing/significantnumbersarebeginnig/comingtorealize/accept/(beaware)that...
[3].Nowthereisagrowingawareness/recognationotthenecessityto......Nowpeoplebecomeincreasinglyaware/consciousoftheimportanceof......
[4].Perhapsitistimetohaveafreshlookattheattitude/ideathat.......
1-4引用法-----先引出名人名言或者有代表性的看法,来引出文章要展开论述的观点!e.g:
[1]."Knowledgeispower."suchistheremarkmadebyBacon.Thisremarkhasbeensharedbymoreandmorepeople.
"Educationisnotcompletewithgradulation."SuchistheopnionofagreatAmericanphilosopher.Nowmoreandmorepeoplesharehisopnion.
[2]."........."Howoftenwehearsuchstatements/wordslikethoses/this.Inourowndaysweareusedtohearingsuchtraditionalcomplainsasthis"......".
1-5比较法------通过对过去,现在两种不同的倾向,观点的比较,引出文章要讨论的观点.e.g:
[1].Foryears,...hadbeenviewedas...Butpeoplearetakingafreshlooknow.Withthegrowing...,people........
[2].Peopleusedtothinkthat...(Inthepast,....)Butpeoplenowsharethisnew.
1-6故事法----先讲一个较短的故事来引发读者的兴趣,引出文章的主题.
e.g:
[1].Oncein(anewspaper),Ireadof/learnt....Thephenemenonof...hasarousedpublicconcern.
[2].Ihaveafriendwho...Shouldhe....?Suchadilemmaweareoftenconfrontwithinourdailylife.
[3].Onceuponatime,therelivedamanwho...Thisstorymaybe(unbelievable),butitstillhasarealisticsignificancenow.
1-8问题法-----先用讨论或解答的设问,引出自己观点,适用于有争议性的话题.
e.g:
Should/What......?Optionsof...varygreatly,some...,others...
Butinmyopinion,.......
Chapter2文章中间主体内容句型原因结果分析
3-1-1.基本原因---分析某事物时,用此句型说明其基本的或者多方面的原因.e.g:
[1].Why...?Foronething..Foranother...
[2].Theanswertothisprobleminvovlesmanyfactors.Foronething...Foranother......Stillanother...
[3].Anumberoffactors,bothphysicalandpsychologicalaffect..../bothindividualandsocialcontributeto....
3-1-2另一原因-------->在分析了基本原因之后,再补充一个次要的或者更重要时用!e.g:
[1].Anotherimportantfactoris....
[2]....isalsoresponsibleforthechange/problem.[3].Certainly,the...isnotthesolereasonfor.....
3-1-3后果影响---------分析某事物可能造成的后果或者带来的影响.e.g:
[1].Itwillproduceaprofound/far-reachingeffect/impacton....[2].Ininvolvessomeseriousconsequencefor........比较对照句型
3-2-1.两者比较--->比较两事物,要说出其一超过另一个,或肯定一事物的优点,也肯定其缺点的时候用!e.g:
[1].TheadvantagesgainedfromAaremuchgreaterthantheadvantageswegainfromB.[2].Indeed,AcarriesmuchweightwhencomparedwithB.
[3].Thereisnodoubtthatithasitsnegativeeffectsaswellaspositiveeffects.3-2-2.两者相同/相似------>比较两事物共同都有或者共同都没有的特点时用!e.g:
[1].AandBhaveseveralthingincommon.Theyaresimilarinthat.....[2].Abearssomesrikingresemblance(s)toB.ChapterThree文章结尾形式
2-1结论性---------通过对文章前面的讨论,引出或重申文章的中心思想及观点.e.g:
[1].Fromwhathasbeendiscussedabove,wemaysafelydrawtheconclusionthat.....[2].Insummary/Inaword,itismorevaluable.......
2-2后果性------揭示所讨论的问题若不解决,将产生的严重后果.e.g:
[1].Wemustcallforanimmediatemethod,becausethecurrentphenomenonof...,ifallowedtoproceed,willsurelyleadtotheheavycostof.......
[2].Obviously,ifweignore/areblindtotheproblem,thereiseverychancethat..willbeputindanger.
2-3号召性--------呼吁读者行动起来,采取行动或提请注意.e.g:
[1].Itistimethatweurgedanimmediateendtotheundesirabletendcyof......
[2].Itisessentialthareffectivemeasuresshouldbetakentocorrectthetendency.
2-4建议性--------对所讨论的问题提出建议性的意见,包括建议和具体的解决问题的方法.e.g:
[1].Whileitcannotbesolvedimmediately,stillthereareways.Themostpopularis....Anothermethodis...Stillanotheroneis.....
[2].Awareness/Recognitionoftheproblemisthefirststeptowardthesituation.
2-5方向性的结尾方式----其与建议性的唯一差别就是对问题解决提出总的,大体的方向或者指明前景.e.g:
[1].Manysolutionsarebeingofferedhere,allofthemmakesomesense,butnoneisadequateenough.Theproblemshouldberecognizedinawideway.
[2].Thereisnoquickmethodtotheissueof..,but..mightbehelpful/benefical.[3].Thegreatchallengetodayis......Thereismuchdifficulty,but........
2--6意义性的结尾方式-------->文章结尾的时候,从更高的更新的角度指出所讨论的问题的重要性以及其深远的意义!e.g:
[1].Followingthesesuggestionsmaynotguaranteethesuccess,butthepayoffmightbeworththeeffort.Itwillnotonlybenefitbutalsobenefit.....
[2].Inanycase,whetheritisposotiveornegative,onethingiscertainthatitwillundoubtedly..
四六级作文经典句子
2.It结构
1)Itisadvisabletoexercise（拥有）patienceindealingwithsuchcomplicatedsituations.
2)Itisadvisabletoplaceimportanttelephonenumbersnesttothephoneincaseofanemergency.
3)Itisbiologicallyreasonablefordeertoreducetheircostoflivingtoincreasetheirchancesofsurvivinginwinter.
4)Itisessentialthattheincreaseinproductionshouldbegearedto(适应)theincreaseinpublicdemand.
5)Itisnecessarythatyoungandoldpeopleshouldcommunicatemorewitheachother.
6)Itisthoughtleofsomeparentstoallowtheirchildrentowatchwhateverprogramisontelevision.
7)Itisincredible(不可思议)thatheatethebigcakejustintowbites.
8)Itwasobvioustoeveryonethatthemarriagewouldsoonerorlaterendinseparationifnotdiverce.
9)ItwasclearthatDadcoulddonomorethanhewasdoingalready.
10)Itiscertainthatfreshairandexercisesaremorevaluablethanmedicine.
11)Itiscertainthatwithdeterminationandhardworkyouwillsucceedeventually.
12)Itwasquiteapparentthatbothsidesweremakingagreatefforttowintheprize.
13)ItwasalmostimpossibleforanIndiantogainevenafaireducationanextremelydifficult,asaresult,foranIndiantoresehighinlife.
14)Itiseasytofallintobadhabitsbutverydifficulttobreakawayformthem.
15)It’snoteasytosizeup(估计)thesituationrightnow.Forwearenotwellinformedonrecentdevelopments.
16)Itisnoteasytosayexactlywhateachpartofthebraindoes.
17)ItisnotwisetochangeyoumoneyintoU.S.currency.
18)Itwasnotuntilabout1600B.C.whenthechariot(马拉战车)wasinventedthatthemaximumspeedwasraisedtoroughlytwentymilesperhour.
19)Itisonlyrecentlythatsciencehasbeguntogiveussomeideaofhowthebrainreallyworks.
20)Itwasnotuntilthecenturythatmanrealizedthatthewholeofthebrainwasinvolvedintheworkingofthemind.
21)Itisconflictandnotunquestioningagreementthatkeepsfreedomalive.
22)ItwasintimesofcrisisthatIfinallyfoundoutwhathewasreallylike.
23)Ittookthehumanracemillionsofyearstoattainthatrecord.
24)Ittookameretwenty-yearflick(一瞬)oftimetodoublethelimitagain.
25)Ittakes(took)sb.sometimetodosth.
26)Ifittakesletimetobringanewideatothemarketplace,italsotakesletimeforittosweepthroughthesociety.
27)Itwilltakethecouncilafewweekstojudgethesituationbeforeittakesanyfurtheraction.
28)Itiswellknownthatmanyofourproblemsarecausedatleastinpartbyfailuretocommunicate.
29)Itisfairlywellknownthatwildanimalssurviveformyeartoyearbyeatingasmuchastheycanduringtimesofplenty.
30)Itisprobablylewellknownthatevenwiththeirstoredfat,wildanimalsspendleenergytoliveinwinterthaninsummer.
31)Itremainsunknownwhetherthereareintelligentbeingsoutsidethesolarsystem.
32)Ithasbeenpointedoutthatin6000B.C.thefastesttransportationavailabletomanover.
33)Itisnowthoughtthatthemoreworkwegiveourbrains,themorew**abletodo.
34)Itcanbearguedthatsucharesponsemaynotmeanmuch(有人认为……)
35)Itisreportedthattheelectronicindustryisgoingonrapidlyinrecentyear.
36)Itisreportedthattherehasbeenadecreaseintheannualbirthrateoverthelasttwodecades.
37)Itisestimatedthatthetotalexpensesinthetrialmanufactureofthenewproductswillcometo30,000yuan.
38)Onceitwasthoughtthatnighttimedreamsinterferedwithourneededrest.
39)Ithasbeenobservedthatunemploymentbringsenormouspsychologicaltroubles.
40)Evenso,itseemedtohimthathewaspartofthewholeevent.
41)ItseemstomethattheAmericansareahighlymobilepeople.Mostofthemliketotravelwhenevertheygetthechance.
42)Itseemedtomethattheonlythingthatmatteredwastogetherhusbandbacktoher.
43)Butitisonlybecauseitismyworktodoso.
44)Itisanencouragingsignthatpeople’spurchasingpower(购买力)isontherise.
45)Itiscommonknowledgethatchalkabsorbsmoisture(湿气)fromtheair.
46)Itmightbeawaytoavoidtheindignityofhavingtoaskformoneyallthetime.
47)Itusedtobeapopularbeliefthewecouldforetellaperson’sfutureonthebasisofthedateandtimeofhisbirth.
48)Itpaysinthelongrun(从长远的角度看……)tointroducenewtechnique.
49)Itistimeforoutsymbolsoftechnologytochange—tocatchupwiththequickeningchangesintechnologyitself.
50)Ithasbeenonlytwenty-fiveyearssincetelevisioncametooneofpeople’spastimes.
51)Itmaywellcomeasasurprisetolearnthatnotonlypsychologistsbutotherbehavioralscientistshavecometoacceptthepositivecontributionofworktotheindividual’shappineandsenseofpersonalachievement.
一、用于驳性和比较性论文
2.Inmyopinion,thispointofviewdoesn’tholdwater.
3.thechiefreasonwhy…isthat…
4.thereisnotruethat…
5.Itisnottruethat…
6.Itcanbeeasilydeniedthan…
7.Wehavenoreasontobelievethat…
8.Whatismoreseriousisthat…
10.Besides,weshouldnotneglectthat…
11.Buttheproblemisnotsosimple.Therefore…
12.Othersmayfindthistobetrue,butIbelieverthat…
14.thereisacertainamountoftruthinthis,butwestillhaveaproblemwithregardto…
18.Itwouldbereasonabletotaketheviewthat…,butitwouldbefoolishtoclaimthat…
21.Itisonethingtoinsistthat…,itisquiteanothertoshowthat…
22.WonderfulasAis,however,ithasitsowndisadvantagestoo.
24.A’sadvantagesoundsridiculouswhenB’sadvantagesaretakenintoconsideration.
二、用于描写图表和数据
1.Ithasincreasedbythreetimesascomparedwiththatof1998.
2.thereisanincreaseof20%intotalthisyear.
3.Ithasbeenincreasedbyafactorof4since1995.
4.Itwouldbeexpectedtoincrease5times.
5.thetableshowsathreetimesincreaseoverthatoflastyear.
6.Itwasdecreasedtwicethanthatoftheyear1996.
7.thetotalnumberwasloweredby10%.
8.Itrosefrom10-15percentofthetotalthisyear.
http://www.oh100.com paredwith1997,itfellfrom15to10percent.
10.thenumberis5timesasmuchasthatof1995.
11.Ithasdecreasedalmosttwoandhalftimes,comparedwith…
三、用于解释性和阐述性论说文
1.Everybodyknowsthat…2.Itcanbeeasilyprovedthat…
3.Itistruethat…4.Noonecandenythat
5.Onethingwhichisequallyimportanttotheabovementionedis…
6.thechiefreasonisthat…7.Wemustrecognizethat…
8.thereisondoubtthat…9.Iamoftheopinionthat…
10.Thiscanbeexpressedasfollows;11.Totake…foranexample…
12.Wehavereasontobelievethat13.Nowthatweknowthat…
14.Amongthemostconvincingreasonsgiven,oneshouldbementioned…
15.thechangein…largelyresultsfromthefactthat
16.thereareseveralcausesforthissignificantgrowth
in…,first…,second…,finally…
17.Anumberoffactorscouldaccountforthedevelopmentin…
18.Perhapstheprimaryreasonis…
19.Itischieflyresponsibleof…
20.thereasonsfor…arecomplicated,Andprobablytheyarefoundinthefact…
21.Hereareseveralpossiblereasons,excerptthat…
http://www.oh100.com …
23.Itisnotsimpletogivethereasonforthiscomplicatedphenomenon…
24.Differentpeopleobservesitindifferentways.
四、用于文章的开头
1.Astheproverbsays…
2.Itgoeswithoutsayingtan…
3.Generallyspeaking…
4.Itisquiteclearthanbecause…
5.Itisoftensaidthat…
6.Manypeopleoftenasksuchquestion:“…？”
7.Moreandmorepeoplehavecometorealize…
8.thereisnodoubtthat…
9.Somepeoplebelievethat…
10.thesedaysweareoftentoldthat,butisthisreallythecase?
12.Recentlytheissueof…hasbeenbroughttopublicattention.
http://www.oh100.com hepastseveralyearstherehasbeen…
14.Nowitiscommonlyheldthat…butIdoubtwhether…
15.Currentlythereisawidespreadconcernthat…
16.Nowpeopleingrowingnumberarecomingtorealizethat…
17.thereisageneraldiscussiontodayabouttheissueof…
18.Facedwith…,quiteafewpeoplearguethat…,butotherpeopleconceivedifferently.
五、用于文章的结尾
1.fromthispointofview…
2.inaword…
3.inconclusion…
4.onaccountofthiswecanfindthat…
5.theresultisdependenton…
6.therefore,thesefindingsrevealthefollowinginformation:
7.thus,thisisthereasonwhywemust…
8.tosumup…
9.asfaras…beconcerned,Ibelievethat…
10.Itisobviousthat…
11.thereislittledoubtthat…
12.thereisnoimmediatesolutiontotheproblemof…,but…mightbehelpful
13.Noneofthesolutionsisquitesatisfactory.Theproblemshouldbeexaminedinanewway.
14.Itishightimethatweputconsiderableemphasison…
15.Takingintoaccountallthesefactors,wemaysafelyreachtheconclustionthat…
六、用于论证和说明
1.Asitisdescribedthat…
2.Ithasbeenillustratedthat…
3.Itprovidesagoodexampleof…
4.Wemayciteanotherinstanceof…
5.Historymanprovidesuswiththeexamplesof…
6.Anumberoffurtherfactsmaybeadded…
7.thesituationisnotunique,itistypicalofdozensIhaveheard.
8.Arecentinvestigationindicatethat…
9.Accordingtothestatisticsprovided…
10.Accordingtoalateststudy,itcanbepredicted…
11.thereisnosufficientevidencetoshowthat…
12.Allavailableevidencepointstothefactthat…
13.Examplesgivenleadsmetoconcludethat…
14.Itrevealstheunquestionablefactthat…
15.theideamaybeprovedbyfacts…
16.Allthefactssuggestthat…
17.Noonecandenythefactthat…
18.Wemayfacetheundeniablefactthat…
●表示比较和对照关系的句型：
1)AistoBwhat/asCistoD(A之于B犹如C之于D).
2)Justas...,so...
3)AandBhavesthincommon.
4)AissimilartoB.
5)thesameistrueof，Thesamecanbesaidof(……也是如此).
6)theadvantagesofAaremuchGREaterthanB.
7)comparedwithB,Ahasmanyadvantages.
8)theadvantagesoutweighthedisadvantages(利大于弊).
9)WonderfulasAis,however,ithasitsowndisadvantagestoo.
10)AlthoughAenjoysconsiderableadvantageover...,itcannotcompetewithBin...
11)Contrarytowidelyacceptedviews,Ibelievethat...
12)Whatpeoplefailtoconsideristhat...
13)Itisonethingtoinsistthat...,itisquiteanothertoshowthat...
14)Nothingcanrival…(……是无与伦比的).
15)…hasdrawbacksaswellasmerits.
16)Aissuperior(inferior)toB.
17)...variesfrompersontoperson(……是因人而异的)
18)Aisjusttheopposite(toB)
19)AdiffersfromBinthat…(A不同于B在于……)
20)…isnotthesame(as)
●过渡性句型：
1)thisistruethat...
2)Thisistrue,nodoubt,but...
3)...also...
4)Itisonethingto...;itisanotherto...
●描写图表和数据的句型
1)...rankfirst(both)in...
2)...inproportionto...
3)Aisbyfarthelargest...
4)Asmanyas....
5)thenumberis...timesasmuchasthatof...
6)thefigurehasnearlydoubled/tripled,asagainstthatoflastyear.
7)Itaccountsfor35%of...
8)Bycomparisonwith...,itdecreased/increased/fellfrom...to...
9)...riserapidly(slowly)
10)...remainlevel...
11)...reach...
12)thereisaslight/slow/steady/rapidrise/increase
demand./income./population./prices./production./decrease/decline/reduction/fall/dropin
13)beontheincrease/decrease/rise/decline(……在不断的增加,减少,上升,下降)
●图表作文中的过渡、概括句型：
1)Ascanbeindicatedinthetable,...
2)Aswecouldfindoutlater，...
3)Asisrevealedinthetable，...
4)Asthesurveyresultsshow，...
5)Thistableprovidesseveralimportantpointsofcomparison
between，...
6)thetwographsdepictthesamethingin...
7)thekeyfindingstakenfromthesurveysareasfollows:
8)Accordingtothefiguresgiveninthetable,...
9)Thischartshowsthat...
10)Asisshownbythegraph,...
11)Itcanbeseenfromthestatisticsthat...
12)Itisgenerallybelieved/accepted/thought/held...
●说明原因的句型:
1)therearesome/two/manygoodreasonsfor.../todo...
2)Wehavetwogoodreasonsfor...
3)thereasonfor...isthat+从句
4)Amongthemostconvincingreasonsgivenbypeoplefor...,oneshouldbementioned...
5)Onemaythinkofthetrendasaresultof...
6)thechangein...largelyresultsfromthefactthat...
7)thereareseveralcausesforthissignificantgrowthin...irst...
8)Anumberoffactorscouldaccountforthe....
9)Itisnosimpletasktogivethereasonfor...
10)thecauseof/reasonforhigherpriceswasanincreaseindemand.
11)Because/As/Nowthat/Sincethedemandhasincreased,thepricesarehigher.
12)Anincreaseindemandcauses/resultsin/leadsto/produceshigherprices.
13)thedemandhasincreased.
14)therefore,/Asaresult,/Forthisreason,/Becauseofthis,/Consequently,thepricesarehigher.
15)Ifthereisanincreaseindemand,thenpricesrise./goup./boost./arehigher.
16)Differentpeoplelookat...indifferentways...
●表示不同看法的句型:
1)Differentpeoplehave/holddifferentopinions/viewsonthe
question/problem/matter.Somebelievethat...;Othersarguethat...:Stillothersmaintainthat...
2)theyarequitedifferentfromeachotherintheiropinions.
3)Somepeopleholdtheopinionthatitisgoodto....
4)theythinkquitedifferentlyonthisquestion.
5)Opinionsvaryfromindividualtoindividual,fromculturetoculture.●表示必须,紧急,有困难做某事的句型:
1)Itisimportant(necessary,urgent,difficult,easy,convenient,
comfortable,expensive,desirable,advisable)forsb.todosth.
2)...havetrouble/difficulty/ahardtime/adifficulttime(in)doingsth.(有困难做某事)
四六级经典句子
1.TypicalofthegrasslanddwellersofthecontinentistheAmericanantelope,orpronghorn.美洲羚羊，或称叉角羚，是该大陆典型的草原动物。
2.OfthemillionswhosawHaley’scometin1986,howmanypeoplewilllivelongenoughtoseeitreturninthetwenty-firstcentury.1986年看见哈雷慧星的千百万人当中，有多少人能够长寿到足以目睹它在二十一世纪的回归呢?
3.Anthropologistshavediscoveredthatfear,happiness,sadness,andsurpriseareuniversally
reflectedinfacialexpressions.人类学家们已经发现，恐惧，快乐，悲伤和惊奇都会行之于色，这在全人类是共通的。4.Becauseofitsirritatingeffectonhumans,theuseofphenolasa
generalantiseptichasbeenlargelydiscontinued.由于其对人体的影响刺激,一般使用酚作为防腐剂已基本停止.5.Anyprofitorganizationstosurviveandultimatelyconsumersmustproduceusableorneededproducts.任何盈利组织若要生存，最终都必须生产出消费者可用或需要的产品。
6.Thegreaterthepopulationthereisinalocality,thegreatertheneedthereisforwater,
transportation,anddisposalofrefuse.一个地方的人口越多，其对水，交通和垃圾处理的需求就会越大。
7.Itismoredifficulttowritesimply,directly,andeffectivelythantoemployflowerybutvagueexpressionsthatonlyobscureone’smeaning.简明，直接，有力的写作难于花哨，含混而意义模糊的表达。
10.Thekneeisthejointswherethethighbonemeetsthelargeboneofthelowerleg.膝盖是大腿骨和小腿胫的连接处。
11.Acidsarechemicalcompoundsthat,inwatersolution,haveasharptaste,acorrosiveactiononmetals,andtheabilitytoturncertainbluevegetabledyesred.酸是一种化合物，它在溶于水时具有强烈的气味和对金属的腐蚀性，并且能够使某些蓝色植物染料变红。
12.BillieHoliday’sreputationasagreatjazz-bluessingerrestsonherabilitytogiveemotionaldepthtohersongs.BillieHoliday’s作为一个爵士布鲁斯乐杰出歌手的名声建立在能够赋予歌曲感情深度的能力。
13.Essentially,atheoryisanabstract,symbolicrepresentationofwhatisconceivedtobereality.理论在本质上是对认识了的现实的一种抽象和符号化的表达。
14.Longbeforechildrenareabletospeakorunderstandalanguage,theycommunicatethroughfacialexpressionsandbymakingnoises.儿童在能说或能听懂语言之前，很久就会通过面部表情和靠发出噪声来与人交流了。
15.Thankstomodernirrigation,cropsnowgrowabundantlyinareaswhereoncenothingbutcactiandsagebrushcouldlive.受当代灌溉(技术设施)之赐，农作物在原来只有仙人掌和荞属科植物才能生存的地方旺盛的生长。
16.Thedevelopmentofmechanicaltimepiecesspurredthesearchformoreaccuratesundialswithwhichtoregulatethem.机械计时器的发展促使人们寻求更精确的日晷，以便校准机械计时器。17.Anthropologyisascienceinthatanthropologistsusearigoroussetofmethodsandtechniquestodocumentobservationsthatcanbecheckedbyothers.人类学是一门科学，因为人类学家采用一整套强有力的方法和技术来记录观测结果，而这样记录下来的观测结果是供他人核查的。18.Fungiareimportantintheproceofdecay,whichreturnsingredientstothesoil,enhancessoilfertility,anddecomposesanimaldebris.真菌在腐化过程中十分重要，而腐化过程将化学物质回馈于土壤，提高其肥力，并分解动物粪便。
19.Whenitisstruck,atuningforkproducesanalmostpuretone,retainingitspitchoveralongperiodoftime.音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。
20.AlthoughpecansaremostplentifulinthesoutheasternpartoftheUnitedStates,theyarefoundasfarnorthasOhioandIllinois.虽然美洲山河桃树最集中于美国的东南部但是在北至俄亥俄州及伊利诺州也能看见它们。
21.Eliminatingproblemsbytransferringtheblametoothersisoftencalledscape-goating.用怪罪别人的办法来解决问题通常被称为寻找替罪羊。
22.Thechieffoodseateninanycountrydependlargelyonwhatgrowsbestinitsclimateandsoil.一个国家的主要食物是什么，大体取决于什么作物在其天气和土壤条件下生长得最好。
23.Overaverylargenumberoftrials,theprobabilityofanevent’soccurringisequaltothe
probabilitythatitwillnotoccur.在大量的实验中，某一事件发生的几率等于它不发生的几率。
24.Mostsubstancecontractwhentheyfreezesothatthedensityofasubstance’ssolidishigherthanthedensityofitsliquid.大多数物质遇冷收缩，所以他们的密度在固态时高于液态。
25.Themechanismbywhichbraincellsstorememoriesisnotclearlyunderstood.大脑细胞储存记忆的机理并不为人明白。