BBC经典-《行星地球》英文解说词(全集)

1行星地球英文解说词第1集PLANETEARTHFromPoletoPoleAhundredyearsagotherewereoneandahalfbillionpeopleonEarth.Now,oversixbillioncrowdourfragileplanetEarth.Butevenso,therearestillplacesbarelytouchedbyhumanity.ThisserieswilltaketothelastwildernessesandshowyoutheplanetEarthanditswildlifeasyouhaveneverseenthembefore.Imagineourworldwithoutsun.MaleEmperorpenguinsarefacingthenearestthatexistsonplanetEarthEarth-winterinAntarctica.It'scontinuouslydarkandtemperaturesdroptominusseventydegreescentigrade.Thepenguinsstaywhenallothercreatureshavefledbecauseeachguardsatreasure:asingleeggrestedonthetopofitsfeetandkeptwarmbeneaththedownybulgeofitsstomach.Thereisnofoodandnowaterforthem,andtheywillnotseethesunagainforfourmonths.Surelynogreaterordealisfacedbyanyanimal.AsthesundepartsfromtheAntarcticitlightenstheskiesinthefarnorth.It'sMarchandlightreturnstothehighArctic,sweepingawayfourmonthsofdarkness.Apolarbearstirs.Shehasbeeninherdenthewholewinter.Heremergencemarksthebeginningofspring.Aftermonthsofconfinementundergroundshetoboggansdowntheslope.Perhapstocleanherfur,perhapsforsheerjoy.Hercubsgazeoutoftheirbrightnewworld2fortheveryfirsttime.Thefemalecallsthem,butthissteepslopeisnottheeasiestplacetotakeyourfirststeps.Buttheyarehungryandeagertoreachtheirmother,who'sdelayedfeedingthemonthisspecialday.Nowsheluresthemwiththepromiseofmilk,theonlyfoodthecubshaveknownsincetheywereborndeafandblindbeneaththesnowsometwomonthsago.Theirmotherhasnoteatenforfivemonthsandhaslosthalfherbodyweight.Nowsheconvertsthelastofherfatreservesintomilkforhercubs.Thespringsunbringswarmthbutalsoaproblemforthemother.Itstartstomelttheseaice.Thatiswhereshehuntsforthesealsheneedstofeedhercubs.Andshemustgettherebeforetheicebreaksup.Fornowthoughit'sstillminusthirtydegreesandthecubsmusthavetheshelteroftheden.It'ssixdayssincethebearsemergedandspringisadvancingrapidly.Butevennowblizzardscanstrikewithoutwarning.Beingsosmall,thecubsareeasilychilledandtheywillbemorecomfortablerestingintheden.Buttheirmothermustkeepthemoutandactive.She'sbecomingweakfromhungerandthere'snofoodonthesenurseryslopes.Theseaicestillholdsfirm,butitwon'tlastmuchlonger.Day10,andthemotherhasledhercubsamilefromtheden.It'stimetoputthemtothetest.They'vegrownenormouslyinconfidence,buttheydon'thavetheirmother'ssenseofurgency.Atlastitseemsthatthey'rereadyfortheirjourneyandthey'reonlyjustintime,forafewmilesfromthecoasttheiceisalreadysplitting.Nowthemothercanstarthuntingfor3thesealstheymusthave,butshe'sleadinghercubsintoadangerousnewworld.Nearlyhalfofallcubsdieintheirfirstyearoutontheice.Summerbrings24hoursofsunlightandthethawingshiftinglandscape.FurthersouththewintersnowshavealmostclearedfromtheArctictundra.NorthernCanada'swildfrontier.Herenaturestagesoneofhergreatestdramas-EveryyearthreemillioncariboumigrateacrosstheArctictundra.Theimmensityoftheherdcanonlybeproperlyappreciatedfromtheair.Someherdstravelover2,000milesayearinsearchoffreshpastures.Thisisthelongestoverlandmigrationmadebyanyanimal.They'reconstantlyonthemove.Newborncalveshavetobeupandrunningthedaytheyareborn.Butthevastherdsdonottravelalone.Wolves.Packsofthem,eighttotenstrong,shadowthemigration.Andtheyarehungry.It'sthenewlyborncalvesthattheyareafter.Runningdirectlyattheherdisaploytogeneratepanic.Theherdbreaksupandnowit'seasiertotargetanindividual.Inthechaosacalfisseparatedfromitsmother.Thecalfisyoung,butitcanoutrunthewolfifonlyitmanagestokeepitsfooting.Atthisstagetheoddsareeven-eitherthecaribouwillmakeamistakeorafteramilethewolfwillgiveup.Midsummeronthetundraandthesundoesnotset.Attheselatitudesthesun'sraysareglancingandnotenoughoftheirenergyreachesthegroundtoenabletreestogrow.You'llneedtotravel500milessouthfromherebeforethatispossible.Thesestuntedshrubsmarkthetreeline-the4beginningoftheborealforest-thetaiga.Theneedle-shapedleavesoftheconifersarevirtuallyinediblesothisforestsupportsverylittleanimallife.It'sasilentplacewherethesnowisunmarkedbyfootprints.IntheArcticwintersnowformsacontinuousblanketacrosstheland.Butasspringcreepsupfromthesouththetaigaisunveiled.ThisvastforestcirclingtheglobecontainsathirdofallthetreesonEarthandproducessomuchoxygenitchangesthecompositionoftheatmosphere.Aswetravelsouthsothesun'sinfluencegrowsstrongerandat50degreesoflatitudearadicaltransformationbegins.Summersherearelongenoughforbroadleaftreestoreplaceconifers.Broadleavesaremucheasiertoeatanddigestsonowanimalscancollecttheirshareoftheenergythathascomefromthesun.It'ssummerandtheseforestsarebustlingwithlife.Butthegoodtimeswillnotlast.Broadleavesmustbeshedinwinterfortheirdamagebyfrost.Astheydisappear,sothelandbecomesbarrenwithlittleforanimalstoeat.Theinhabitantsmustmigrate,hibernate,orfacemonthsofnearstarvation.TheAmurleopard-therarestcatintheworld.Here,inthedeciduousforestsofeasternRussiathewintermakeshuntingverydifficult.Prayanimalsarescarce,andthere'snoconcealingvegetation.Thecubisayearoldandstilldependentonitsmother.Deerarefrequentcasualtiesoftheharshwinterandtheseleopardsarenotabovescavengingfromacorpse.Africanleopardscouldneversurvivehere,buttheRussiancatshavethickfurtoshieldthemf