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The thing about extinction events is that, of course they're very bad for the animals that go extinct, but they open up a door of opportunity for a lot of other animals and plants. 其实就灭绝事件来说，当然对走向灭绝的动物来说很糟
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The male realizes that the female will not be responsive as long as her offspring is alive. 雄性意识到只要小玛君龙还活着雌性就不会有反应。 He knows he's got to get rid of that baby. 它知道必须得先除掉幼崽。 In his b
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Albertosaurus hunted in small groups of up to five. 阿尔伯特龙小群狩猎，每群多可达五头。 A herd of Pachyrhinosaurus would have been more than capable of standing their ground against a single Albertosaurus. 一群肿鼻角龙面对一
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70 million years ago,Albertosaurus was the most fearsome hunter in North America. 七千万年前，阿尔伯特龙是北美洲最可怕的猎手。 It was one of the few dinosaurs that would take on the horned Arctic dinosaur. 它是少数敢于攻击
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It was a species of Tyrannosaur. 这是暴龙的一种。 That suggested to us, well, maybe these Tyrannosaur teeth are in fact from animals that are trampling the bodies of these things as they eat them. 那就表明，也许这些暴龙牙齿是它们
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In order to understand the hunting methods of Albertosaurus, paleontologists compared its brain design to that of modern animals. 为了了解阿尔伯特龙的狩猎方式，古生物学家将其脑部构造与现代动物进行比较。 The brain s
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Camarasaurus also owed its success to a set of long, spoon-shaped teeth that, paleontologists came to realize, could defoliate entire trees. 圆顶龙成功的另一个原因是（牙齿露出5厘米，含牙根8厘米）它们长长的匙状牙齿古生
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What makes a Raptor so incredibly dangerous is that they're built like ninjas. 迅猛龙之所以如此危险，是因为其身体构造像忍者一样。 They're fast, they're strong, they're agile, they've got razor sharp teeth and these teeth curv
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Alone or in a group, this dinosaur's greatest strength was its colossal bulk. 无论是单独或群体的腱龙，最大的优势来自其庞大的身躯。 But despite its staggering power, the Tenontosaurus had two inherent weaknesses. 但尽管其力
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On a barren hillside in the badlands of Montana, a group of paleontologists had uncovered a 115-million-year-old site. 在蒙大拿不毛之地的荒芜山坡上，一队古生物学家发现了一亿一千五百万年前的古战场。 Four deadly R
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We now believe that Ceratosaurus may have been an ambush predator. 我们现在相信角鼻龙可能是一种伏击掠食者。 Hunting in pairs would allow this meat eater to take on bigger game or to set up an ambush to capture smaller fast moving
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Everything that happens to an animal after it dies destroys information and that's the reason why in the end so little is left. 动物死后发生的每件事都会销毁信息，这就是最后剩不下什么的原因。 But think of the luck that w
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Ceratosaurus, for 20 million years, he'd been one of the unchallenged predators at the top of the food chain. 角鼻龙，长达两千万年间，他高居食物链的顶端，无可匹敌。 But by using new science and re-examining the evidence at
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The biting sperm whale was powered by the up and down motion of its powerful tail fluke allowing it to reach speeds of over 25 miles per hour. 噬抹香鲸用其有力的尾鳍上下摆动来获得动力，其速度能达到每小时25英里。 The l
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I don't think Allosaurus played well with others. 我觉得异特龙不会与其它恐龙好好相处。 And so it makes sense to me that it would attempt to kill any competitor in its territory. 所以我觉得它会试图杀死任何进入它领地的
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Being faster and more agile than your prey was an important attribute, but the ability to ambush prey was a even more lethal hunting strategy. 比猎物更快更灵活十分重要的品质，但伏击猎物是一个更为致命的狩猎策略。 Pred
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This was typical with plant eaters, but less commonly seen in predators before this time. 这在植食性动物中很典型，不过在此前的掠食者中并不常见。 What's interesting with Allosaurus, we find large accumulations of Allosaurus'
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One Allosaurus moved off to flank the unsuspecting Ceratosaurus. 一头异特龙离开绕向毫无防备的角鼻龙侧面。 The rest headed to center stage. 其余的前往主战场。 The Ceratosaurus is out numbered and scientists now know it was
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Along with its massive size, powerful jaws and dagger-like teeth, investigators discovered something else. 除了其巨大体型，有力的双颌以及匕首般的牙齿之外，调查者发现了其他的事情。 Megalodon stalked its prey with an
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Three Allosaurus have killed a Ceratosaurus. 三头异特龙杀死了一头角鼻龙。 A Stegosaurus, wielding his lethal tail spikes, has killed one of the unsuspecting Allosaurus. 一头剑龙抡起致命的尾刺干掉了一头没有防备的异特
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