Everyoneisprovidedbynaturewithasetoffinger-printsentirelydifferentfromthoseofeverybodyelse.Itisnowacceptedasascientificfactthatnotwopeoplehavethesamefinger-printsThetenfinger-printsofonepersonalwaysdifferfromthecompletesetofanother.Butthatisnotall.Theprintofeachseparatefingerofapersondiffersfromhisprintsofallotherfingersandfromtheprintsofotherfingersintheworld.Someonehascalculatedthechancethataprintmadebyonepersonwillbethesameasaprintmadebyanotherandthecalculationshowsthatthechanceissosmallthatforallpracticalpurpose,itdoesn’texist.Thepolice,therefore,alwaysrecordfinger-prints,ifpossible,theyareanunfailingcluetoidentifywhenoncetheyhavebeenobtained.Finger-printidentificationasitisknownandpracticedtodayisofcomparatively(相当地)recentorigin.ItfirstcametothenoticeofmodernpoliceforcesinIndia.Finger-printswerefoundsovaluabletherethattheywerelateradoptedbythepoliceofothercountries.Theyacceptedaslegalevidenceinacourtoflaw;ifaman’sprintsarefoundonthesceneofthecrime,itistakenforgrantedthathewasthere,thoughwhenandwhyhewasthereareotherquestions.36.Whichofthefollowingbestexpressesthemainideaofthepassage?
Withmoreandmorecarsontheroad，thetrafficjamwillhappen.Howdoweseeitandhowcanwesolvetheproblem?Weknowthatthetrafficjamhappensinmanyplaces,especiallyinbigcities.Whatarereasonsfortheproblem?Ontheonehand，somepeoplethinkthattheyshouldhaveacarwhentheyhaveenoughmoney,andthenit'seasytogooutandtheycanfeelcomfortable.Ontheotherhand,agrowingnumberofpeoplehopetousetheircarstoshowoff.What’smore,yearsofresearchhasshownthatoneofotherreasonsforthetrafficjamisthedrivinghabit.Forexample,manyyoungpeopleenjoydrivingveryfast,sotheycanfeelexcited.Atlast,mostofthemhardlycareaboutthespeedrules.Manygovernmentsareworkingathowtomakethetrafficbetter．Inmyopinion,firstly,thegovernmentsshouldeducatethosepeoplewhohavecarsorplantobuycars.Thegovernmentsmustmakethemknowthatthetrafficjamisveryserious,andsetupamuchmoreperfecttrafficsystemtosolvethetrafficpressure.36.Whatdoestheunderlinedword"jam"meaninChinese?