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仅供个人参考不得用于商业用途Forpersonaluseonlyinstudyandresearch;notforcommercialuse中英文对照字幕请听我说Listentome,please.你跟我一样，是智人You'relikeme,aHomosapiens.一个有智慧的人Awisehuman.生命是宇宙的奇迹Life,amiracleintheuniverse,出现于约四十亿年前appearedaroundfourbillionyearsago,而我们人类只有二十万年历史andwehumansonly200,000yearsago.但是我们却破坏了Yetwehavesucceededindisruptingthebalance...地球生命赖以生存的平衡thatissoessentialtolifeonEarth.请细听这个不寻常的的故事，你的故事Listencarefullytothisextraordinarystory,whichisyours,然后决定你应该做什么anddecidewhatyouwanttodowithit.这是我们的起源的轨迹Thesearetracesofourorigins.最初，我们的星球不过是一个浑沌的火球Atthebeginning,ourplanetwasnomorethanachaosoffire,伴随它的恒星--太阳诞生而形成的formedinthewakeofitsstar,thesun.一团粘聚的尘埃颗粒Acloudofagglutinateddustparticles,就像宇宙里面许多类似的星云similartosomanysimilarclustersintheuniverse.然而生命的奇迹就在此诞生Yetthiswaswherethemiracleoflifeoccurred.今天，我们的生命Today,life-ourlife-是地球上无数生物形成的生命链中的一环isjustalinkinachainofinnumerablelivingbeings...在近40亿年里，这些生物被彼此继承取代thathavesucceededoneanotheronEarthovernearlyfourbillionyears.即使到了今天，新的火山继续改变我们的景观Andeventoday,newvolcanoescontinuetosculptourlandscapes.它们让我们目睹了盘古初开时地球的样子TheyofferaglimpseofwhatourEarthwaslikeatitsbirth熔石从深处涌出仅供个人参考不得用于商业用途moltenrocksurgingfromthedepths,开始凝固，裂开solidifying,cracking,冒着泡，或摊开形成薄的外壳blisteringorspreadinginathincrust,然后再休眠一段时间beforefablingdormantforatime.这些从地球内部吐出缭绕的烟圈ThesewreathsofsmokecurlingfromthebowelsoftheEarth...是地球原始大气层的见证bearwitnesstotheEarth'soriginalatmosphere.一个没有氧气的大气层Anatmospheredevoidofoxygen.稠密的大气层，充满水蒸气和二氧化碳Adenseatmosphere,thickwithwatervapor,fullofcarbondioxide.一个熔炉Afurnace.因为有水，地球有了一个与众不同的未来ButtheEarthhadanexceptionalfuture,offeredtoitbywater.地球与太阳之间的距离适中不太远，不太近Attherightdistancefromthesun—nottoofar,nottoonear因此地球上的水能够处于液体状态theEarthwasabletoconservewaterinliquidform.水蒸气凝结后形成滂沱大雨降落在地球上WatervaporcondensedandfellintorrentialdownpoursonEarth,河流出现了andriversappeared.河流改变了地球表面TheriversshapedthesurfaceoftheEarth,刻削着河道cuttingtheirchannels,并冲刷出山谷furrowingoutvalleys.它们流向地球上最低洼的地方形成海洋Theyrantowardthelowestplacesontheglobetoformtheoceans.水溶解了岩石的矿物质Theytoremineralsfromtherocks,渐渐的，海洋中的淡水andgraduallythefreshwateroftheoceans...变成了咸水becameheavywithsalt.水是生命必需的液体Waterisavitalliquid.它灌溉了这些广阔的不毛之地Itirrigatedthesesterileexpanses.仅供个人参考不得用于商业用途水流就像人体的血管Thepathsittracedareliketheveinsofabody,树木的枝丫，是让大地苏醒的液体导管thebranchesofatree,thevesselsofthesapthatitbroughttotheEarth.40亿年后Nearlyfourbillionyearslater,地球上的某些地方还能找到这样的艺术创作somewhereonEarthcanstillbefoundtheseworksofart,火山灰混合着来自冰岛冰川的水leftbythevolcanoes'ash,mixedwithwaterfromIceland'sglaciers.就是它们，物质和水Theretheyare-matterandwater,水和物质waterandmatter-软硬组合，这对地球上所有生物都是至关重要的softandhardcombined,thecrucialalliancesharedbyeverylife-formonourplanet.金属矿物元素比地球还要古老MineralsandmetalsareevenolderthantheEarth.它们是星尘Theyarestardust.它们让地球五彩斑斓TheyprovidetheEarth'scolors.红色是铁，黑色是碳Redfromiron,blackfromcarbon,蓝色是铜，黄色则是硫bluefromcopper,yellowfromsulfur.我们来自什么哪里？Wheredowecomefrom?生命火花从哪里迸发？Wheredidlifefirstsparkintobeing?一个时光奇迹Amiracleoftime,地球上的温泉仍然有原始的生命存活primitivelife-formsstillexistintheglobe'shotsprings.它们赋予温泉颜色Theygivethemtheircolors.它们叫做“古细菌”They'recalledarchaeobacteria.它们都依靠地球热能生存TheyallfeedofftheEarth'sheat除了蓝细菌，或是蓝绿藻以外allexceptthecyanobacteria,orblue-greenalgae.只有它们可以向着太阳来吸取其能量Theyalonehavethecapacitytoturntothesuntocaptureitsenergy.它们是古今所有植种的最重要的祖先Theyareavitalancestorofallyesterday'sandtoday'splantspecies.仅供个人参考不得用于商业用途这些微小的细菌Thesetinybacteria...及其数以亿计的后代andtheirbillionsofdescendants...改变了地球的命运changedthedestinyofourplanet.是它们改造了地球的大气层Theytransformeditsatmosphere.毒害大气层的碳去了哪里？Whathappenedtothecarbonthatpoisonedtheatmosphere?它还存在，只是被“囚禁”在地壳It'sstillhere,imprisonedintheEarth'scrust.想要了解地球历史的这一篇章WecanreadthischapteroftheEarth'shistory...卡罗拉多大峡谷的峭壁是最好的选择nowherebetterthanonthewallsofColorado'sGrandCanyon.它们展现了地球近20亿年的历史TheyrevealnearbytwobillionyearsoftheEarth'shistory.大峡谷曾经是一个聚居着微生物的海洋Onceuponatime,theGrandCanyonwasaseainhabitedbymicroorganisms.它们汲取从大气层溶解到海洋里的碳Theygrewtheirshellsbytappingintocarbonfromtheatmosphere...并长出外壳dissolvedintheocean.它们死后Whentheydied,theshellssank...外壳沉到海床堆叠起来andaccumulatedonthesealed.这些地层就是它们无数的外壳构成的Thesestrataaretheproductofthosebillionsandbillionsofshells.因为有了它们，碳从大气层中排出Thankstothem,thecarbondrainedfromtheatmosphere,其他生物才能得以发展andotherlife-formscoulddevelop.生命改变了大气层Itislifethatalteredtheatmosphere.植物靠太阳能存活Plantlifefedoffthesun'senergy,这能量使植物分离水分子whichenabledittobreakapartthewatermolecule...并释放出来氧气andtaketheoxygen.空气因而充满氧气Andoxygenfilledtheair.地球的水不断更新循环TheEarth'swatercycleisaprocessofconstantrenewal.仅供个人参考不得用于商业用途瀑布，水蒸气，Waterfalls,watervapor,云、雨、泉clouds,rain,springs,河流、海洋、冰川rivers,seas,oceans,glaciers.这个循环从未间断Thecycleisneverbroken.地球的水量恒久不变There'salwaysthesamequantityofwateronEarth.历来的生物都喝同样的水AllthesuccessivespeciesonEarthhavedrunkthesamewater.水是令人惊叹的物质Theastonishingmatterthatiswater.是最不稳定的一种Oneofthemostunstableofall.它可以是液态的流水Ittakesaliquidformasrunningwater,气态的蒸汽gaseousasvapor...或是固态的冰orsolidasice.在西伯利亚，冬季结冰的湖面InSiberia,thefrozensurfacesofthelakesinwinter...蕴含着水在结冰时展现的力量containthetracesoftheforcesthatwaterdeployswhenitfreezes.冰比水轻因而浮于水面Lighterthanwater,theicefloats,不会沉到湖底r