翻译下面这两段话Theattractionforstudentsmightatfirstseemobvious.Primarily,there’stheconveniencepromisedbycoursesontheNet:youcandothework,astheysay,inyourpajamas(睡衣).Butfiguresindicatethatthereducedef

　　翻译下面这两段话

　　Theattractionforstudentsmightatfirstseemobvious.Primarily,there’stheconveniencepromisedbycoursesontheNet:youcandothework,astheysay,inyourpajamas(睡衣).Butfiguresindicatethatthereducedeffortresultsinareducedcommitmenttothecourse.WhiledropoutratesforallfreshmenatAmericanuniversitiesisaround20percent,therateforonlinestudentsis35percent.Studentsthemselvesseemtounderstandtheweaknessesinherentinthesetup.InasurveyconductedforCornell,theDLdivisionofCornellUniversity,lessthanathirdoftherespondentsexpectedthequalityoftheonlinecoursetobeasgoodastheclassroomcourse.

　　Clearly,fromtheschools’perspective,there’salotofmoneytobesaved.Althoughsomeofthemoreambitiousprogramsrequirenewinvestmentsinserversandnetworkstosupportcollaborativesoftware,mostDLcoursescanrunonexistingorminimallyupgraded(升级)systems.Themorestudentswhoenrollinacoursebutdon’tcometocampus,themoretheschoolsavesonkeepingthelightsonintheclassrooms,payingdoorkeepers,andmaintainingparkinglots.And,whilethere’sevidencethatinstructorsmustworkhardertorunaDLcourseforavarietyofreasons,theywon’tbepaidanymore,andmightwellbepaidless.