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Although these were not considered giant predators, they were still packed with muscle. 虽然不是巨型掠食者，它们也相当壮实。 These would've had some bearing on their speed and agility. 这对它们的速度和灵活性会有影响。
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Giant long-necked Sauropods were able to browse at treetop levels, while other plant eating dinosaurs were perfectly adapted to take advantage of the low-growing vegetation. 巨大的长颈蜥脚类恐龙能够吃树顶上的嫩枝，而其它的植食
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How big an asteroid would it take to distribute this much Iridium around the entire planet? 到底要多大的小行星才能将这么多铱散布在整个星球上？ And they come up with a very rough number of something on the order of ten kilomet
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Using science as a guide, we attempt to recreate the final moments of the dinosaurs. 我们以科学为指引，试图重建恐龙的最后时刻。 The first effect was the impact itself. 第一个效果是撞击本身。 So when a 10-kilometer diam
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5 minutes to impact. 距离撞击五分钟。 The sky is now illuminated by the glowing orb as it draws closer. 随着小行星的靠近，天空现在被耀眼的火球照亮。 The asteroid begins to heat up as it comes into contact with our atmosp
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When Witmer studied the skull, he saw that there were serrated ridges in the teeth. 维特莫研究其颅骨时，看到牙齿里有锯齿状的脊状隆起。 The ridges are remarkably similar to those of another animal with a deadly bite, a Komodo
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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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Gastonia, being a large animal, was very stocky and well-muscled. 加斯顿龙，作为一个大型动物，非常健壮、肌肉发达。 Utahraptor, for a predatory dinosaur, particularly a Dromaeosaur, it's a very strong powerfully-built animal as
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Like all raptors, Utahraptor was one of the top predators of its time. 和所有迅猛龙一样，犹他盗龙是当时的顶级掠食者之一。 But unlike its cousins, this raptor was not built for speed. 不过跟它的亲戚们不同，这种迅猛
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Utahraptor is the largest known member of the early Dromaeosaurids, which were birdlike meat-eating dinosaurs. 犹他盗龙是最大的已知早期驰龙成员，它们是类鸟的肉食恐龙。 It killed by pouncing onto the back of its prey. 它们跳
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These were big but really fast hunters. They were as bad as it got for a while. 这些巨大但速度很快的猎手。有一段时间它们要多坏有多坏。 Albertosaurus would have been a very fearsome predator. 阿尔伯特龙会是非常可怕的
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Utahraptors stayed on the migration routes of the herbivores, lying in wait for their unsuspected prey. 犹他盗龙埋伏在植食动物迁徙的必经之路上，躺着等它未知的猎物。 Utahraptor may have been more of an ambush predator. 犹他
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Now, Ceratosaurus had appeared on earth long before the first Allosaurus showed up. 角鼻龙在地球上的出现远要早于最早的异特龙。 But towards the end of Jurassic, we find fewer and fewer skeletons of Ceratosaurus, but more and more
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The end of the Ice Age saw a world that was melting away.Plants and animals hopelessly struggling to survive. 在冰期末期整个世界冰消雪解。植物和动物绝望地挣扎求生。 The disruption triggered a massive food shortage. 这一混乱
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The lion's senses are keen.Its whiskers can pick up vibrations.So it can sense animals as small as a mouse in pitch darkness. 拟狮的感官很敏锐。它的胡须能感知振动。所以它能在漆黑一片的情况下感知到和老鼠一样小的
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The bear was 4 meters tall, and weighed nearly a ton. 短面熊站起来有四米高，重量接近一吨。 Its paws were the size of a human head and its claws were 16 centimeters long. 它的脚掌有人的头那么大，爪子的长度达十六厘米
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