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1、CableNewsNetwork(CNN)isaU.S.cablenewschannelfoundedin1980byTedTurner.[1][2]Uponitslaunch,CNNwasthefirstchanneltoprovide24-hourtelevisionnewscoverage,[3]andthefirstall-newstelevisionchannelintheUnitedStates.[4]Whilethenewschannelhasnumerousaffiliates,CNNprimarilybroa
2、dcastsfromitsheadquartersattheCNNCenterinAtlanta,theTimeWarnerCenterinNewYorkCity,andstudiosinWashington,D.C.andLosAngeles.CNNisownedbyparentcompanyTimeWarner,andtheU.S.newschannelisadivisionoftheTurnerBroadcastingSystem.[5]CNNissometimesreferredtoasCNN/U.S.todistin
3、guishtheAmericanchannelfromitsinternationalcounterpart,CNNInternational.AsofAugust2010,CNNisavailableinover100millionU.S.households.[6]Broadcastcoverageextendstoover890,000Americanhotelrooms,[6]andtheU.SbroadcastisalsoshowninCanada.Globally,CNNprogrammingairsthrough
4、CNNInternational,whichcanbeseenbyviewersinover212countriesandterritories.[7]AlthoughCNNhasthemostuniqueviewers(NielsenCumeRatings)intheUScablenewsmarket,intermsofregularviewers(Nielsenratings)itbattlesMSNBCforsecondplacewellbehindFOXNews,CNNhavingsufferedratingsdecl
5、inesin2009and2010.[8][9][10]EarlyhistoryMainarticle:HistoryofCNN(1980–2003)TheCableNewsNetworkwaslaunchedat5:00p.m.ESTonSundayJune1,1980.AfteranintroductionbyTedTurner,thehusbandandwifeteamofDavidWalkerandLoisHartanchoredthefirstnewscast.[11]Sinceitsdebut,CNNhasexpa
6、ndeditsreachtoanumberofcableandsatellitetelevisioncompanies,severalwebsites,specializedclosed-circuitchannels(suchasCNNAirportNetwork),andaradionetwork.Thecompanyhas36bureaus(10domestic,26international),morethan900affiliatedlocalstations,andseveralregionalandforeign
7、-languagenetworksaroundtheworld.Thechannel'ssuccessmadeabona-fidemoguloffounderTedTurnerandsetthestagefortheTimeWarnerconglomerate'seventualacquisitionofTurnerBroadcasting.Acompanionchannel,CNN2,waslaunchedonJanuary1,1982andfeaturedacontinuous24-hourcycleof30-minute
8、newsbroadcasts.Ayearlater,itchangeditsnameto"CNNHeadlineNews",andeventuallyitwassimplycalled"HeadlineNews".(In2005,HeadlineNewswouldbreakf
