例子一 　　AfterIcametoLuoyangNormalUniversity,Igetintouchwithmoreandmorecollegestudents.Ifindaveryseriousproblemaboutunhealthyhabitsofcollegestudents,whichaffectsoutregularcollegelife. 　　Firstly,alargenumberofstudentsstayuplateeveryday,butsometimesgetupearly.Whentheyarriveatclassroom,theyfeelverytired.Secondly,somecollegestudentsbecomeaddictedtocomputergamesandspendtoomuchtimeonthem.Thirdly,somecollegestudentsareinlovewiththeirfriends.Whenacollegestudenttellshisbelovedthathewillloveherforever,itprobablycan’tbetrue.Intheend,manycollegestudentshaveunhealthyeatinghabits.Sometimes,theygotoclasseswithouthavingbreakfast,sotheymayhavestomachdiseasesifthislastlong. 　　Ascollegestudents,weshouldfindoutthereasonwhywehavesomanyunhealthyhabits.Inseniormiddleschool,weweretoobusytorelaxourselves,whilewehavefullfreetimewhenwecametocollege,sowebecomelazier. 　　例子二 　　Recently,theproblemsofcollegestudentshavebeenbroughtintofocusespeciallytheirunhealthyhabits. 　　Thefirstpartisabouttheirlife.Manyofthemoftensleepsolatethatthenextdaytheyhavenoenoughenergytostudyandoftenhaveahurriedbreakfastforgettinguplate.Thenextpartisabouttheirentertainment.Manystudentsespeciallyboysarelostincomputergames.Theyoftenspendtoomuchtimeonitandforgettosleep,eatandstudy.Therearealsosomebadhabitsintheireating.Manyboysandgirlssmokeanddrinkalotandeattoomuchjunkfood. 　　Theunhealthyhabitsareduetothefactthattheyoftenhavealotofsparetimeandtheydon’tknowhowtomakefulluseofit.Anotherreasonisthattheylosetheiraimsandtheydon’tknowwhattheywanttodointhefuture.