参考文献：相关文献概览

1.AconsiderableamountofliteraturehasbeenpublishedonX.Thesestudies......
2.Thereisalargevolumeofpublishedstudiesdescribingtheroleof......
3.ThefirstseriousdiscussionsandanalysesofXemergedduringthe1970swith......
4.Thegeneralisabilityofmuchpublishedresearchonthisissueisproblematic.
5.WhatweknowaboutXislargelybaseduponempiricalstudiesthatinvestigatehow......
6.Duringthepast30yearsmuchmoreinformationhasbecomeavailableon......
7.Inrecentyears,therehasbeenanincreasingamountofliteratureon.......
8.Alargeandgrowingbodyofliteraturehasinvestigated......

参考文献：以往研究或学术活动相关文献

1.Manyhistorianshavearguedthat......(eg.Jones,1987;Johnson,1990;Smith,1994)
2.Numerousstudieshaveattemptedtoexplain.....(forexample,Smith,1996;Kelly,1998;Johnson,2002)
3.Recentevidencesuggeststhat.......(Smith,1996;Jones1999;Johnson,2001)
4.Recently,invitrostudieshaveshownthatT.thermophylusEFTucan......(Pateletal.,1997;Jonesetal.,1998).
5.SurveyssuchasthatconductedbySmith(1988)haveshownthat......
6.Severalattemptshavebeenmadeto.......(Smith,1996;Jones1999;Johnson,2001)
7.SeveralstudieshaverevealedthatitisnotjustXthatactson......(Smith,1996;Jones.......
8.SeveralbiographiesofHarrishavebeenpublished.Smithpresentsan........account,whilstJones.....
9.SeveralstudiesinvestigatingXhavebeencarriedouton......
10.Datafromseveralsourceshaveidentifiedtheincreasedmorbidityandmortalityassociatedwithobesity
11.Previousstudieshavereported......(Smith,1985;Jones,1987;Johnson,1992).
12.PreviousresearchfindingsintoXhavebeeninconsistentandcontradictory(Smith,1996;Jones1999,......
13.Anumberofstudieshavefoundthat......(Smith,2003;Jones,2004).
14.Twentycohortstudyanalyseshaveexaminedtherelationshipbetween.......
15.Atleast152case-controlstudiesworldwidehaveexaminedtherelationshipbetween......
16.Otherstudieshaveconsideredtherelationship......
17.TherelationshipbetweenXandYhasbeenwidelyinvestigated(Smith,1985;Jones,1987,.......
18.ThecausesofXhavebeenwidelyinvestigated(Jones,1987;Johnson,1990;Smith,1994).
19.ThegeologyofXhasbeenaddressedinseveralsmallscaleinvestigationsand.......
20.Xshavebeenidentifiedasmajorcontributingfactorsforthedeclineofmanyspecies(1).
21.Xhasalsobeenshowntoreversetheanti-inflammatoryeffectsofglucocorticoidsinmurine-inducedarthritis(11).
22.IthasbeensuggestedthatlevelsofXareindependentofthesizeoftheY(Smithetal.,1995)IthasconclusivelybeenshownthatXandYincreaseZ(Smithetal.,1999;Jones,2001......
23.IthasbeendemonstratedthatahighintakeofXresultsindamageto......(Smith,1998;......

文章重点：当前理论存在的问题、局限性

1.Onequestionthatneedstobeasked,however,iswhether......
2.Aseriousweaknesswiththisargument,however,isthat......
3.Oneofthelimitationswiththisexplanationisthatitdoesnotexplainwhy...4.OnecriticismofmuchoftheliteratureonXisthat......
5.Thekeyproblemwiththisexplanationisthat......
6.TheexistingaccountsfailtoresolvethecontradictionbetweenXandY.
7.However,thereisaninconsistencywiththisargument.
8.Smith'sargumentreliestooheavilyonqualitativeanalysisof......
9.ItseemsthatJones'understandingoftheXframeworkisquestionable.Smith'sinterpretationoverlooksmuchofthehistoricalresearch......
10.OnemajorcriticismofSmith'sworkisthat.....
11.ManywritershavechallengedJones'claimonthegroundsthat.......
12.X'sanalysisdoesnottakeaccountof.....nordoesheexamine......

文章重点：研究方法存在的问题、局限性

1.AnotherproblemwiththisapproachisthatitfailstotakeXintoaccount.
2.Perhapsthemostseriousdisadvantageofthismethodisthat.....
3.Difficultiesarise,however,whenanattemptismadetoimplementthepolicy.
4.Nevertheless,thestrategyhasnotescapedcriticismfromgovernments,agenciesandacademics.
5.Onemajordrawbackofthisapproachisthat......
6.Themainlimitationofbiosyntheticincorporation,however,is......
7.However,thismethodofanalysishasanumberoflimitations.
8.However,approachesofthiskindcarrywiththemvariouswellknownlimitations.
9.Allthestudiesreviewedsofar,however,sufferfromthefactthat.......
10.However,therearelimitstohowfartheideaof/conceptofXcanbetaken.
11.However,suchexplanationstendtooverlookthefactthat......
12.However,oneoftheproblemswiththeinstrumenttheresearchersusedtomeasureXwas......



描述实验方法：强调一个特殊的方法

1.Articlereferencesweresearchedfurtherforadditionalrelevantpublications.ArticlesweresearchedfromJanuary1965untilApril2008.
2.Publicationswereonlyincludedif.......