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1、文献简介1.RecentlyinvestigatorshaveexaminedtheeffectsofXonY.2.Inthepasttwodecadesanumberofresearchershavesoughttodetermine......3.Previousstudieshavereported......4.AconsiderableamountofliteraturehasbeenpublishedonX.Thesestudies......5.Smith(1984:217)showshow,inthepast,
2、researchintoXwasmainlyconcernedwith.......6.SurveyssuchasthatconductedbySmith(1988)showedthat......7.ThefirstseriousdiscussionsandanalysesofXemergedduringthe1970swith......8.Recentevidencesuggeststhat.......9.Severalattempshavebeenmadeto......10.Anumberofresearchers
3、havereported......11.XswerereportedinthefirstmodelsofY(e.g.,Smith,1977;Smith,&Patel,1977).12.WhatweknowaboutXislargelybaseduponempiricalstudiesthatinvestigatehow......StudiesofXshowtheimportanceof.....强调研究领域存在的问题1.However,theserapidchangesarehavingaseriouseffect....
4、..2.However,amajorproblemwiththiskindofapplicationis......3.LackofXhasexistedasahealthproblemformanyyears.Despiteitssafetyandefficacy,Xsuffersfromseveralmajordrawbacks:4.However,researchhasconsistentlyshownthatfirstyearstudentshavenotattainedanadequateunderstandingo
5、f......5.ThereisincreasingconcernthatsomeXsarebeingdisadvantaged......6.Despiteitslongclinicalsuccess,Xhasanumberofproblemsinuse.7.Questionshavebeenraisedaboutthesafetyofprolongeduseof......强调研究领域存在的争议1.Todatetherehasbeenlittleagreementonwhat......2.Morerecently,lit
6、eraturehasemergedthatofferscontradictoryfindingsabout.....3.Oneobserverhasalreadydrawnattentiontotheparadoxin......4.InmanyXsadebateistakingplacebetweenYsandZsconcerning......5.ThecontroversyaboutscientificevidenceforXhasragedunabatedforoveracentury.6.Debatecontinue
7、saboutthebeststrategiesforthemanagementof......7.Thisconcepthasrecentlybeenchallengedby.......studiesdemonstrating.......强调研究领域的知识差距1.Sofar,however,therehasbeenlittlediscussionabout......2.LittleisknownaboutXanditisnotclearwhatfactors.......3.However,fartoolittleatt
8、entionhasbeenpaidto......4.Inaddition,noresearchhasbeenfoundthatsurveyed.......5.Sofarthismethodhasonlybeenappliedto......6.Thisindicatesa
