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英语练习阅读技巧英语练习阅读技巧WhatDoestheMultimediaActuallyMean?Literally,multimediameanstwoormoremedia.Ifthepublisherofthisbookwantedtojointhecurrenthypeaboutmultimedia,hecouldadvertisethebookasusingmultimediatechnology.Afterall,itcontainstwomedia:textandgraphics(thefigures).Nevertheless,whenmostpeoplerefertomultimedia,theygenerallymeanthecombinationoftwoormorecontinuousmedia,thatis,mediahavetobeplayedduringsomewell-definedtimedtimesinterval,usuallywiththeusersinteraction.Inpractice,thetwomediaarenormallyaudioandvideo,thatis,soundplusmovingpictures.Inthemultimediaenvironment,wehavegraphicsandtextatthesametime,wecanalsoaddthephotograph,animation,good-qualitysound,andfullmotionvideo.Allofthetechnologiesmakecomputersmoreinterestingandmucheasiertouse.Forexample,amultimediaprogramcanplayasegmentofmovie：acatwasplayingareelofthread,withmewingThetableaucanabeimmediatelycapturedandpastedtoatextatthesideofaparagraphofwords.CD-ROMCD-ROMisanopticaltechnologythatisusedtomakecompactdisksforCDstereosystems;ithasnowbeenadaptedtostoredataforcomputers.CDdiskisanopticaldisc,onwhichdataisrecordedasasetofdipsinthesurface.Whenalaserbeamshinesacrossthedips,thereflecteddistortionrepresentsthedata.Opticaldischasa600megabytecapacityandarewellsuitedforthecomputerapplicationsneedingthevaststorage.Theplaybackeffectofopticaldiscsformusicisveryperfect,nohissandcrackleaswithotherphoto-records.AcomputersystemmusthaveaCDdriverthatisdesignedtoreadthedisksandtranslatethedataintoaformitcanprocess.CDdiskscanstorehugevolumesofdataandareveryusefulforreferencematerialanencyclopedia,forexample.However,asthename(read-onlymemory)implies,CDdiskscannotbewrittenonorchangedinanyway.
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