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1AcademicEnglishUnit3
SectionIIntroductionPurpose1.providingreaderswithbackgroundinformation2.convincingreadersofthenecessityorsignificanceofthecurrentstudy
Functions1.winningreaders’attentionandinterest2.encouragingreaderstocontinuereading
4
3or4parts1.Researchfieldbackground,nature,scopedefinitions2.Previousresearchliteraturereviewanditscontributionsweaknessesorlimitationsinthepreviousresearch（gap）3.Presentresearchhypotheses,purposeprincipalfindings,outline
5ForReference:
ExpressionsandSentencesInrecentyears,therehasbeenagreatinterestin…Itisnoteworthythat…hasmadeprogress…Inmoststudiesof…,…hasbeenemphasizedwithattentionbeinggivento…Severalresearchershavetheoreticallyinvestigated…Littleliteratureisavailableon……poseaproblemofconsiderableinterestinmanyindustrialapplications.
6Itisimportanttostudy…Inthispaper,…isdiscussed(studied,presented,investigated,described,etc.)Theprimarygoalofthisresearchis…Thepurposeofthispaper(study,thesis,etc.)is…Theemphasisofthispaperistosurvey…Thepresentstudyisthereforefocusedon…Thispaperreportson…Thepresentworkdealsmainlywith…
背景写作句型Inrecentyears,therehasbeenagreatinterestin…Itisnoteworthythat…hasmadeprogress…Inmoststudiesof…,…hasbeenemphasizedwithattentionbeinggivento…Severalresearchershavetheoreticallyinvestigated…
引言写作句型
提出问题时Littleliteratureisavailableon……poseaproblemofconsiderableinterestinmanyindustrialapplications.
主题写作句型Itisimportanttostudy…Inthispaper,…isdiscussed(studied,presented,investigated,described,etc.)Theprimarygoalofthisresearchis…Thepurposeofthispaper(study,thesis,etc.)is…Theemphasisofthispaperistosurvey…Thepresentstudyisthereforefocusedon…Thispaperreportson…Thepresentworkdealsmainlywith…
P80Exercise21.Theresearchfield:Each
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