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1、DefinitionofESTlItreferstoanypieceofspokenorwrittenEnglishlanguagedealingwithscienceandtechnology.lESTexplainsitscontentsthroughusinglotsfscientificandtechnicalterminologiesandsigns,andfrequentlydrawingsupportfromgraphsandpictures.lItisalanguageusedbythescientists
2、andtechniciansinaspecialsituation.Itisofinformational,communicativestyle,whichisdifferentfromGeneralEnglishandLiteraryEnglishinstyle,includingvocabulary,syntax,discourseandaesthetics.lInshort,ESTlaysstressonthedescriptionofobjectivethings,onthejudgmentoffactsoront
3、hereasoningoflogicalconcepts,probingintotherealvalueoftheobjectiveworld.Therefore,itshowsaccuracy,logicalityandobjectivity.CharacteristicsofESTlEST,asaspecialEnglishstyle,emphasizesexactness,science,logicality,andcompactnessandhasuniquelanguagestructures.lItslangu
4、ageaimsforanaccurate,objective,logicalandconcisestyle.Itssentencesarelogicalintheirmeaningsandinteracttoeachother.MainfeaturesofESTingrammarlTheapplicationofnominalization;lNon-personalsubject;lLongsentences;lPassivevoice;lOmission.StyleofESTlAccuracylObjectivitye
5、.g.lLogicalitye.g.lConcisenessClInconclusionwecanseethattherearemainlyfourfeaturesinEST:theyareaccuracy,objectivity,logicality,andconciseness.Thesefeaturesarereflectedoneveryfacetofvocabulary,syntaxanddiscourse,etc.Butgenerallyspeaking,theirrelationshipsinfluencea
6、ndinteracteachother.LexicalcharacteristicsofESTlESTvocabularycanbedividedintothreecategoriesaccordingtoitsmeaningsandfunctions:highlytechnicalwordsorterminologies;semi-/sub-technicalwords;non-technicalwords.lTechnicalwordsrefertothewordsthatcanexactlyexplaindefini
7、teconceptsinaspecificfieldofscienceandtechnology.lSub-technicalwords,alsoknownassemi-technicalwordsaredefinedascontext-dependentwordsthatoccurwithhighfrequencyacrossdisciplines.e.g.lNon-technicalwordstendtooccurparticularlyfrequentintechnicalEnglish.Stransmissionl
8、“发射,播送“inradioengineering;l“传动，变速”inmechanicalengineering;l“透射“inphysics;l“遗传”inmedicine.lSyntacticalCharacteristicslExtensiveuseofpassivevoicelFrequent
