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1、拉斯维加斯LasVegasisthemostpopulouscityinNevada,UnitedStates,theseatofClarkCounty,andaninternationallyrenownedmajorresortcityforgambling,shoppingandfinedining.LasVegas,whichbillsitselfasTheEntertainmentCapitaloftheWorld,isfamousforthenumberofcasinoresortsandassociatedentertainm
2、ent.Agrowingretirementandfamilycity,itisthe28thmostpopulouscityintheUnitedStateswithanestimatedpopulationbytheU.S.CensusBureauof583,756asof2010.The2010populationestimateoftheLasVegasmetropolitanareawas1,951,269.Establishedin1905,LasVegasofficiallybecameacityin1911.Withtheg
3、rowththatfollowed,atthecloseofthecenturyLasVegaswasthemostpopulousAmericancityfoundedinthe20thcentury(adistinctionheldbyChicagointhe19thcentury).Thecity'stoleranceforvariousformsofadultentertainmentearneditthetitleofSinCity,andthisimagehasmadeLasVegasapopularsettingforfilm
4、sandtelevisionprograms.TherearenumerousoutdoorlightingdisplaysonFremontStreet,aswellaselsewhereinthecity.ThenameLasVegasisoftenappliedtounincorporatedareasthatsurroundthecity,especiallytheresortareasonandnearTheLasVegasStrip.The4.2mi(6.8km)stretchofLasVegasBoulevardknownas
5、theStripismainlyintheunincorporatedcommunitiesofParadiseandWinchester,andtheunincorporatedcommunityofEnterprise五角大楼ThePentagonistheheadquartersoftheUnitedStatesDepartmentofDefense,locatedat48N.RotaryRoad,Arlington,Virginia22211(Map).Itsmailingaddressis"Washington,DC20301."
6、AsasymboloftheUSmilitary,"thePentagon"isoftenusedmetonymicallytorefertotheDepartmentofDefenseratherthanthebuildingitself.ThosewhoworkwithinitswallsoftensimplycallittheBuilding.ThebuildingwasdedicatedonJanuary15,1943.Itisthehighest-capacityofficebuildingintheworldandoneofth
7、eworld'slargestbuildingsintermsoffloorarea.Ithousesapproximately23,000militaryandcivilianemployeesandabout3,000non-defensesupportpersonnel.Ithasfivesides,fivefloorsaboveground(plustwobasementlevels),andfiveringcorridorsperfloorwithatotalof17.5miles(28km)ofcorridors.Atfivea
8、cres(20,000m²),thecentralplazainthePentagonistheworld'slargest"no-salute,no-cover"area(an
