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1、TodayIwilltalkaboutAmericaYellowstoneNationalPark.NorthEntranceYellowstoneNationalParkisanationalparklocatedprimarilyintheU.S.stateofWyoming,althoughitalsoextendsintoMontanaandIdaho.ItwasestablishedbytheU.S.CongressandsignedintolawbyPresidentUlyssesS.GrantonMarch1,1872.Yellowstone,wid
2、elyheldtobethefirstnationalparkintheworld,isknownforitswildlifeanditsmanygeothermalfeatures.OldFaithfulGeyser[ˈɡaɪzɚ] (老忠实间歇泉)Eruptions[ɪ'rʌpʃn]canshoot3,700to8,400USgallons(14,000to32,000L)ofboilingwatertoaheightof106to185feet(32to56m)lastingfrom1.5to5minutes.Theaverageheightofanerup
3、tionis145feet(44m).Intervalsbetweeneruptionscanrangefrom45to125minutes,averaging66.5minutesin1939,slowlyincreasingtoanaverageof90minutesaparttoday.GrandPrismaticSpring [prɪzˈmætɪk](大棱镜)TheGrandPrismaticSpringisthelargesthotspringintheUnitedStates,andthethirdlargestintheworld.Thespring
4、isapproximately[əˈprɒksɪmətli]80mto90minsizeand50mindepth.GrandPrismaticSpringwasnamedbythemforitsstrikingcoloration.Itscolorsmatchtherainbowdispersionofwhitelightbyanopticalprism['prɪzəm]:red,orange,yellow,green,andblue.TheGrandCanyonoftheYellowstoneisthefirstlargecanyonontheYellowst
5、oneRiverdownstreamfromYellowstoneFallsinYellowstoneNationalPark.Thecanyonisapproximately24mileslong,between244mand366mdeepandbetween0.45kmand1.2kmwide.TheGrandCanyonoftheYellowstone['kænjən]黄石公园的大峡谷MammothHotSpring['mæməθ](猛犸象温泉)MammothHotSpringsisalargecomplexofhotspringsonahilloftra
6、vertine['trævəti:n]inYellowstoneNationalParkadjacent[əˈdʒeɪsnt]toFortYellowstoneandtheMammothHotSpringsHistoricDistrict.Itwascreatedoverthousandsofyearsashotwaterfromthespringcooledanddepositedcalcium['kælsɪəm]carbonate['kɑ:bəneɪt](overtwotonsflowintoMammotheachdayinasolution).Flora['
7、flɔ:rə]（植物群）Over1,700speciesoftreesandothervascular[ˈvæskjələ(r)]plantsarenativetothepark.Another170speciesareconsideredtobeexotic[ɪɡ'zɒtɪk]speciesandarenon-native.Oftheeightconifer['kɒnɪfə(r)]treespeciesdocumented,LodgepolePineforestscover80%ofthetotalforestedareas.Yellowstonesandver
8、bena[
