世界未解之谜英文ppt

1TheWorldofUnsolvedMysteries———TheFourthGroup2TheunsolvedmysteryofBermudaTriangle3Theinterestandintrigue(诡秘)fortheBermudaTriangle(百慕大三角)hasbeenglobalagendaformanydecadesnow.Thetragic(悲剧的)incidencesandmishaps(灾祸)attachedtotheBermudaTrianglehavealsogivenitthesecondnameofDevil’sTriangle(魔鬼三角洲).4Asthemysteriousdisappearancesofshipsandaircraftintheregion,theBermudaTriangleisnotoriously(众所周知地)known.5•WhereistheBermudaTrianglelocated?LocatedinthewesternpartoftheNorthAtlanticOcean,theapexes(顶端)ofthetrianglearegenerallybelievedtobeBermuda;Miami-Florida(佛罗里达州);andSanJuan-PuertoRico(波多黎各).6•Themostfamous“Flight19″Incident:On5thDecember1945,fiveTBMAvengertorpedobombers（”复仇者“鱼雷轰炸机）having14airmensuddenlydisappearedduringatrainingsessionwhileflyingovertheBermudaTriangle.7Later,aPBMMarinerFlyingBoatexploded(爆炸)whilesearchingforthemhaving13crewmembers.Noneoftheinvestigatorswasabletotellthereasonbehindthisterribleincident.8Doyouwantachancetotravelthroughtime?Let'sreadarealstoryhappenedthere.9In1990,therewasaballute(热气球式降落伞)suddenlyappearedattheareaofCuba(古巴).AndthismadethegovernmentofCubaverynervous.Theytreateditasasecretweapon(秘密武器)fromAmeriaandmadeittoucheddown.Atthesametime,thetwoballoondriverwerealsoconfused,theysaidtheyparticipatedinaballuterace,andsuddenlyfeltalittlepain,thentheysawtheblueskyandaplanewhichmakethemdown.10Yes,therewasaballuteraceatCaribbean(加勒比海)in1954.Itwasalovelydayfortherace,butsuddenlyoneoftheballutesdisappearedfromthesky.Thatistosaythetwodrivershadfliedfrom1954to1990unconsciously.11•BermudaTriangleTheories:Overtheyears,scientistsandotherresearchershavecited(引用)differentnaturalexplanationsforthesedisappearances.Someoftheseinclude:CompassVariations（罗经磁差）:ThetheoryopinedthattheBermudaTriangleisoneofthetwoplacesonearthatwhichamagneticcompass(罗盘)pointstowardstruenorthratherthantheusualmagneticnorth.Thisdifferenceorvibration(振动)betweenthetwo,putatalmost60degrees,cametobetermedascompassvariation.12GulfStream（墨西哥湾流）:Astrongoceancurrent（气流）originatingfromtheGulfofMexicocalledtheGulfStreamhasalsobeenheldresponsiblefortheunexplaineddisasters.Thecurrentisextremelyswift（迅速的）,turbulentandknowntohaveasurfacevelocity（速率）ofaround2.5m/s.However,itistheorized（推理）thatsuchacurrentcancarryawayonlysmallplaneslandinginwaterorboatswithsomeenginetrouble(发动机故障).13MethaneHydrates(沼气泡新观点):Manyofthelateresearchesandlabexperimentshaveblamedthepresenceofmethanehydratesforthemishaps(灾祸)intheregion(地区).Thistheorystatesthattheenormouseruptions(巨大喷发)ofmethanebubbles(沼气泡)mayproduceregionsoffrothywateraroundtheshipultimatelyleadingtoitsrapidsinking(下沉).Likewise,theaircraftfallingvictimtothesebubbleswilllosetheirenginesandimmediatelylosetheirliftaswell,ultimatelyleadingtoaswiftplummeting(骤然下跌).14AlthoughBermudaTriangleisoneofthemostmysteriousplacesintheworldandmanypeoplewouldliketovisitthisplacebutontheothersidetherearemanypeoplewhowouldneverliketobethere.What’syourplan?15TheunsolvedmysteryofCropCirclesHowthecirclesaremade?16Whomakesthem?17TaiChi181920Cropcircles（麦田怪圈）areinafieldofwheatorothercrops,throughsomeforcetoflatten（压平）andcropsproducegeometricpatterns（几何图纹）.Thisphenomenoninthelate1970'sbegantoattractpublic’sattention.21Onlythecropbend.弯曲22Cellstructureinthestalkwaschanged23Mildburns24InCropCirclesproductionhasincreasedfourfoldGO25Theworldforthecauseofthecirclealsohasavarietyofviews.Aboutthecauses,mainlyhavefivekindsofviews.Magneticfield(磁场说):Theexpertsthinkthat,themagneticfieldshaveamagicalmobileforce,canproduceanelectriccurrent(电流),makecropflatontheground.26Thetornado(龙卷风说):Fromtherelevantrecords,theseasoncropcirclesappearedmostfrequentlyarespringandsummer,somepeoplethinkthatsummerweather,constantlychanging,themainreasoncausedthecircleisthetornado.27Alienmanufacturing(外星制造说):Manypeoplebelieve,cropcirclesaremostlyformedovernight,islikelytobeextraterrestrial(天外来客).Allegedly,whereappearedcropcircleswhereitwillappearUFO.28Forecast(预言说):Somepeoplebelievethatthereisamysteriouspowerbehindthecropcircles,accordingtothisguess,somepeoplethinkthatcropcirclesaredisasterforecasts.29Artificial(人造说)：Quiteapartofpeoplethinkthat,theso-calledcropcirclesarejustsomepeople‘spracticaljoke.BritishscientistAndrewthrough17yearsofinvestigationthinks,cropcircleshave80%belongstoman-made.Butthisviewcan'texplian30Buthowdoyouthinkaboutthisphenomenon?31TheunsolvedmysteryofEgyptianPyramids32NearthemoderncityofCairoliesthelargestandmostimposingconcentrationofpyramidsintheworld,thoseoftheGizaPlateau.在开罗这座现代城市附近的吉萨高地上，集中座落着世界上最大、最壮观的金字塔群。33Built4,000yearsago,thethreegreatpyramidsatGiza(吉萨),intheEgyptiandesertremainthemostcolossalbuildingseverconstructed.Pyramidsfunctionedastombsforpharaohs.古埃及金字塔是奴隶制帝王的陵墓。34Pyramid,meansthecones(锥体)inarchitecture,ingeneralhavebasesofequilateraltriangle(等边三角形)orsquarepolygon(广边多边形),mayalsobeotherpolygon,topofthepyramidisverysmall,andevenintothespire-like(尖顶).Ancientpyramidismadeofstonestack(堆叠),beingabletowithstand(抵挡)naturaldisasters.35Thegreatpyramid,alsoknownaskhufu,is770feetononesideand481feettall.最大的金字塔——胡夫金字塔，每边长770英尺，