BBC经典《行星地球》英文解说词全集Word格式文档下载.docx

BBC经典《行星地球》英文解说词全集Word格式文档下载.docx

《BBC经典《行星地球》英文解说词全集Word格式文档下载.docx》由会员分享，可在线阅读，更多相关《BBC经典《行星地球》英文解说词全集Word格式文档下载.docx（61页珍藏版）》请在冰点文库上搜索。

scontinuouslydarkandtemperaturesdroptominusseventydegreescentigrade.Thepenguinsstaywhenallothercreatureshavefledbecauseeachguardsatreasure:

asingleeggrestedonthetopofitsfeetandkeptwarmbeneaththedownybulgeofitsstomach.Thereisnofoodandnowaterforthem,andtheywillnotseethesunagainforfourmonths.Surelynogreaterordealisfacedbyanyanimal.AsthesundepartsfromtheAntarcticitlightenstheskiesinthefarnorth.It'

sMarchandlightreturnstothehighArctic,sweepingawayfourmonthsofdarkness.Apolarbearstirs.Shehasbeeninherdenthewholewinter.Heremergencemarksthebeginningofspring.Aftermonthsofconfinementundergroundshetoboggansdowntheslope.Perhapstocleanherfur,perhapsforsheerjoy.Hercubsgazeoutoftheirbrightnewworldfortheveryfirsttime.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.Nowthemothercanstarthuntingforthesealstheymusthave,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-thebeginningoftheborealforest-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,buttheRussiancatshavethickfurtoshieldthemfromthecold.ThereareonlyfortyAmurleopardsleftinthewildandthatnumberisfalling.Likesomanycreatures,thecatshavebeenpushedtotheveryedgeofextinctionbyhuntingandthedestructionoftheirhabitat.TheAmurleopardsymbolisesthefragilityofournaturalheritage.Thefutureofanentirespecieshangsonsurvivalofatinynumberofmotherslikethisone.Allanimals,rareorcommon,ultimatelydependfortheirenergyonthesun.InJapanthearrivalofthecherryblossomannouncesthebeginningofspring.Thesun'

senergybringscolourtothelandscape.Theearth,asitmakesitsannualjourneyaroundthesun,spinsonatiltedaxis.Andit'

sthistiltthatcreatestheseasons.Theadvanceoftheseasonsbringsconstantchange.Asthesun'

sinfluencediminishesinthenorth,sothedeciduousforestsofAmericabegintoshutdownlosingtheirleavesinpreparationforthedarkcoldmonthsahead.Oneseasonhandsovertoanother.Someorganismsthriveondecay,butmostmustmakespecialpreparationsforwinterandalifewithlittlesun.Wholepopulationsofanimalsarenowforcedtotravelgreatdistancesinpursuitoffoodandwarmth.300,000BaikaltealgathertoescapefromtheSiberianwinterbymigratingsouthtoKorea-theworld'

sentirepopulationinasingleflock.Buttherearepartsoftheworldthathavenoseasons.Inthetropicsthesun'

sraysstriketheearthheadonandtheirstrengthismoreorlessconstantallyearround.Thatiswhythejunglegrowssovigourouslyandsupportssomuchlife.Thisforestcoversonly3percentoftheplanet'

ssurface,butitcontainsmorethan50percentofallitsplantsandanimals.Thecanopyisparticularlyrich.Therearemonkeys,birdsandmillionsofspeciesofinsects,exactlyhowmanywehavenoidea.Thecharacteroftheforestchangesaswedescend,becomingeverdarkeranddamper,favouringdifferentkindsofanimalsandplants.Lessthan2percentofthesunlightreachesthefloor,butevenherethereisextraordinaryvariety.InthegreatislandofNewGuineathereare42differentspeciesofbirdsofparadise,eachmorebizarrethanthelast.Thisforestissorichthatnourishingfoodcanbegatheredveryquickly.Thatleavesthemalesix-plumedbirdofparadisewithtimetoconcentrateonothermattersliketidyinguphisdisplayarea.Everythingmustbespickandspan.Allisready.Veryimpressive,butnooneiswatching.Thesuperbbirdofparadisecallstoattractafemale.Andhehasmoreluck.Butwhatdoeshehavetodotoreallyimpressher?

Sheretirestoconsiderherverdict.It'

shardnottofeeldeflatedwhenevenyourbestisn'

tgoodenough.Thesuninfluenceslifeintheoceansjustasitdoesonland.Itsrichestpartsarethosewherewavesandcurrentsbringfertilisingnutrientstosurfacewatersthatarebathedinsunlight.TheseasofftheCapeinSouthAfricahavethismagicrecipeandarehugelyproductive.Summeristhetimeofplentyandit'

snowthatthesealsstarttobreed.Thestrikeofagreatwhitesharklastsameresecond.Slowingitdownfortytimesrevealsthetechniqueandimmensestrengthofthismassivepredator.Ifsurprisefails,therewillbeachase.Thesharkisfasteronastraightcoursebutitcan'

tturnassharplyastheseal,itsagilityversuspower.Oncethesealshavefinishedbreedingthegiantsharkswillmoveon.It'

snowbecomingclearthatgreatwhitesmigratethousandsofmilesacrosstheoceanstoharvestseasonalabundancesindifferentseas.Thesun,beatingdownontropicalwaters,powerstheweathersystemsoftheglobe.Moistureevaporatesfromthewarmingoceanandrisestocreategreatstorms.Thewindsgeneratedoutatseasweepinlandacrossthecontinents.AstheytravelacrosstheSaharatheycreatethebiggestofallsandstormsblowingsandh