• This break in Earth's history is marked by a mass extinction, when as many as half the species on the planet became extinct.

    地球历史上的这次重大灾难以物种大量消亡标志;当时地球多达一半物种都灭绝了。

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  • In this movie, a comet miles across is headed toward Earth, sure to cause a mass extinction if it hits.

    这部影片里,颗直径几英里的彗星直奔地球,一旦撞上,就会是天崩地裂的大灾难。

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  • None of it lines up to say a mass extinction and there is very little evidence to say humans drove the extinction.

    没有个数据指出一次大规模灭绝而且很少证据说是人类导致它们的灭绝。

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  • People for the sake of money, keep killing them, leading to a mass extinction of wild animals. Until the SARS incident, people wake…

    人们为了钱财不断杀害它们导致野生动物大量灭绝

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  • One fragment of that ancient smash is thought to have struck Earth 65 million years ago, triggering a mass extinction that wiped out the dinosaurs.

    认为,那次古老冲撞碎片在六千五百万年前曾经撞击地球引发消灭恐龙的大灭绝

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  • It is also time to take stock, though. Human activities are causing a mass extinction, but the right action now could pull life back from the brink.

    虽然现在时候算算账了,人类确实很多物种濒临灭绝但是我们已经采取措施濒临灭绝的物种消失的边缘了回来

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  • Unfortunately, frogs the world over are suffering a mass extinction. Perhaps something in the newly cracked genetic code can help save them before they croak.

    不幸的是,世界各地青蛙遭受灭绝的厄运,或许通过此次破译基因密码,我们赶在它们灭绝之前做点什么,挽救这种稀有生物。

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  • Our global society has started to destroy species of other organisms at an accelerating rate, initiating a mass extinction episode unparalleled for 65 million years.

    我们人类社会已经开始加速毁灭其他生物物种并由此开启了一个6500万年以来大规模物种灭绝

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  • Straddling the late Ordovician period and the early Silurian period, the Andean-Saharan ice age was marked by a mass extinction, the second most severe in Earth's history.

    Andean - Saharan冰河期横跨Ordovician冰河期的后期Silurian冰河期前期,大灭绝成为了其标志性事件,是地球历史上第二个气候恶劣的时期。

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  • Even so, "it's very important to devote resources and legislation toward species conservation if we don't want to be the species whose activity caused a mass extinction."

    尽管如此,“如果我们希望成为物种灭绝罪魁祸首,还需要在财政立法物种保护进行大力支持。”

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  • Once every 100 million years or so, an even larger asteroid may cause a mass extinction; most scientists believe a six-mile-wide asteroid doomed the dinosaurs 65 million years ago.

    隔1亿左右大的小行星可能导致物种大灭绝。大多数科学家相信颗6英里直径的小行星在6500万年前使恐龙灭绝。

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  • Many scientists, as reported in the Guardian last week, fear that concentrations of CO2 in the atmosphere are already high enough to ensure a mass extinction of coral in the coming decades.

    正如卫报》于上周的一份报道说许多科学家担心二氧化碳大气层中的浓度已经足以在未来数十年内保证出现珊瑚灭绝。

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  • Following each mass extinction, there is a sudden evolutionary burst as new species develop to fill the ecological niches opened by the event.

    物种大灭绝后,都一次突然进化爆发因为会有物种出现填补灭绝创造生态

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  • While there are a dozen or more mass extinctions in the geological record, the Cretaceous mass extinction has always intrigued paleontologists because it marks the end of the age of the dinosaurs.

    虽然地质记录十几甚至更多灭绝,但白垩纪的大灭绝总是引起古生物学家兴趣,因为标志着恐龙时代结束

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  • Today we are witnessing a sixth mass extinction, but unlike the others, the current loss of bio-diversity can be traced to human activity.

    今天我们正在见证第六次物种大灭绝,其它几次不同是,目前生物多样性丧失可以追溯到人类活动。

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  • As Permian life-forms declined, they reached a fatal threshold and species succumbed to mass extinction.

    随着二叠纪生命形式的衰退它们达到了一个致命临界点物种最终走向了大灭绝。

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  • Scientists have linked the mass extinction at the end of the Cretaceous with a meteorite impact on Earth.

    科学家白垩纪末期灭绝地球陨石撞击联系起来。

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  • This marks precisely—to within a few thousand yearsthe point of mass extinction on the land.

    明确标志着正是几千年中,发生陆地上大规模灭绝

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  • A bigger mass extinction, at the end of the Permian period 251m years ago, killed 70% of the world's land vertebrates (and 96% of all Marine animals) and paved the way for the age of reptiles.

    大规模灭绝发生25100万年前二叠纪末期致使世界上70%陆地脊椎动物(96%的海洋动物)死亡,同时造就爬行动物的时代

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  • However, some researchers believe that a GRB was responsible for the Ordovician mass extinction approximately 450 million years ago.

    然而有一些研究者认为大约4.5亿年前奥陶纪灭绝伽马射线爆引起的。

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  • Keller stressed these findings do not deny that an impact occurred around the K-T boundary, and noted that one or possibly several impacts may have had a hand in the mass extinction.

    凯勒强调这些调查结果并不否认影响发生周围K - T边界指出其中一几个可能影响有可能大量物种灭绝中起作用

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  • But, for those of a nervous disposition, the tying of an ancient greenhouse warming to an ancient mass extinction might suggest lessons for the future.

    但是对于这些性情冲动火山,古代温室变暖和古代大量物种灭绝之间联系或许未来有诸多的借鉴意义。

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  • The study of the ecosystems in the survival and recovery time in the Early Triassic following the end-Permian mass extinction becomes a hotspot.

    二叠纪末大灭绝之后,三叠纪残存复苏期生态研究成为当今热点。

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  • A newly-discovered treasure trove of ancient fossils are helping scientists understand how life on Earth recovered from the most catastrophic mass extinction of all time.

    次最新发现贵重古生物化石帮忙科学家们领会有史以来大规模生物灭绝之后,生命如何重生的。

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  • This eruption was a massive occurrence with environmental impacts that were felt globally, however, it did not produce mass extinction of any widespread group of organisms.

    这次喷发一次足以影响全球的大事件但是没有引起任何广泛分布生物种群大规模灭绝

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  • The results show that the mass extinction coefficient of the hollow particles increases to a great extent when contrasted with that of the solid ones unde.

    结果表明空心复合微粒相对于同外径实心粒子,质量消光系数较大提高

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  • Some 208 million years ago, another mass extinction took a toll primarily on sea creatures, but also some land animals.

    两亿零八百万以前又一次大规模物种灭绝灾难发生首当其冲受害的是海洋生物某些陆生动物未能幸免。

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  • An example is the KT Mass Extinction when the last dinosaur and ammonite species, among others, became extinct, perhaps as a result of an asteroid striking the Earth.

    比如白垩纪至第三纪所发生的大灭绝当时可能由于小行星撞击地球,恐龙众多同时代物种灭绝了。

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  • Earth's sixth mass extinction is already underway - and humans are the driving force behind it, according to a new study.

    地球第六次物种大灭绝正在上演。一项新的研究发现,人类背后推动力

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  • Earth's sixth mass extinction is already underway - and humans are the driving force behind it, according to a new study.

    地球第六次物种大灭绝正在上演。一项新的研究发现,人类背后推动力

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