MissWhite:我认为一只蓝鲸比一只恐龙大。
Miss White:A blue whale is bigger than a dinossaur, I think.
一些恐龙像建筑物一样大。
化石记录表明，在地球有动物居住的所有时期，已经有五次大灭绝发生，恐龙是最近的一次。
The fossil record indicates that in all the time that animals have inhabited Earth, there have been five great mass extinctions, dinosaurs being the most recent.
虽然在地质记录中有十几次甚至更多的大灭绝，但白垩纪的大灭绝总是引起古生物学家的兴趣，因为它标志着恐龙时代的结束。
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.
在埃及沙漠中挖掘时，古生物学家们发现了巨大的骨骼化石，这似乎是有史以来体型第二大的恐龙。
While digging in the Egyptian desert, huge fossil bones have been found by paleontologists, which appears to have been the second most massive dinosaur that ever lived.
经过八千万年的演化，他们变成了长脖子的草食性恐龙，并且长得像拖拉机那么大了，就如迷惑龙，以前称雷龙，那么大。
Over the course of 80 million years, they evolved into tractor-trailer sized, long-necked plant-eaters, like Apatosaurus, formerly known as Brontosaurus.
孩子们会安静下来，然后开始观看这头紫色大恐龙即将上演的表演。
The kids would quieten down and start watching the show the big purple dinosaur was putting on.
在恐龙时期这个地区则更多为泛滥平原环境，平坦的平原上纵横交错着大而曲折的河流。
Back in the dinosaur era, it was more of a floodplain environment, with a flat plain crisscrossed by big, meandering rivers.
这些大灭绝中最近的一次也是人们最熟悉的一次，终结了恐龙时代。
The most recent of the Big Five is the most familiar one—the cataclysm that ended the Age of Dinosaurs.
它不会很大地影响到我们怎么看待鸟类来源于恐龙的大构图，但影响到一些小细节：对动物生物学很重要的小改变。
It doesn't affect much of our big picture view of how birds came from dinosaurs, but some of the minutiae: the small changes that are important to the biology of the animals.
相反，栖息地的破坏继续有增无减，一些专家警告说，地球现正面临其第六次大灭绝阶段-自6500万年前恐龙消失最新的一次。
Instead, habitat destruction has continued unabated, and some experts now warn that the planet faces its sixth mass extinction phase — the latest since dinosaurs vanished 65 million years ago.
据认为，那次古老冲撞的碎片在六千五百万年前曾经撞击地球，引发了消灭恐龙的大灭绝。
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.
众所周知，6千5百万年前一颗小行星的撞击导致了恐龙的灭绝，然而一颗大彗星的撞击可能是同样致命的。
An asteroid impact is famously responsible for the extinction of the dinosaurs 65 million years ago, but large comet impacts may be equally deadly.
发现这么大的动物真令人惊奇，古生物学家们在怀疑我们到底对恐龙时代的生态系统有多少不知道的。
The discovery of such a large animal is startling, making paleontologists wonder how much we still don't know about the ecosystem during the "Age of Dinosaurs."
闯入地球的小行星一般被认为是白垩-第三纪灭绝，即恐龙遭受大灭绝的主要原因之一。 那次毁灭性事件灭绝了地球上超过一半的物种，为哺乳动物成为地球上的首要物种扫清了道路。
The extinction was caused by a massive asteroid slamming into Earth at Chicxulub in Mexico.
中国或许是个庞然大物，但它不是一只恐龙。
150年来，一个物种叫“始祖鸟”已经被当作是第一只真正的鸟，代表着从恐龙进化后的一大步。
For 150 years, a species called Archaeopteryx has been regarded as the first true bird, representing a major evolutionary step away from dinosaurs.
像恐龙那么大。
恐龙为什么以及如何成长为如此的庞然大物，是科学家试图回答已久的问题。
Why and how dinosaurs grew into such massive creatures is a question that scientists have been trying to answer for a long time.
我们的车直接穿过恐龙的大嘴。
最近一次大影响是65亿年前，导致了恐龙灭绝。
The last big impact was 65 million years ago, and that led to the extinction of the dinosaurs.
铱：如果铱听起来让你觉得熟悉，那可能是因为很多通讯卫星都是以这种硬而脆的大密度金属元素命名的，也可能是因为恐龙在白垩纪末从地球灭绝，与铱有关的缘故。
Iridium (Ir): If iridium sounds familiar, that might be because there’s a group of communications satellites named after this element, a hard, brittle and dense metal.
这些庞然大物要吃多少东西才能维持它们巨大身体的需要？ 就在一些来参观的游客可能会对此感到好奇时，那些研究恐龙的专家的思绪早已飞回了侏罗纪时代。
Some visitors may wonder how the creatures could ever eat enough to sustain their size, but the Explainer's mind is in the Jurassic gutter.
据新的研究发现，在8300万年前的恐龙时代生活着一种巨大的史前鸟类，这种鸟外形可能颇似一只非常大的鸵鸟。
An enormous prehistoric bird, which might have resembled a very big ostrich, lived alongside dinosaurs around 83 million years ago, according to new research.
每隔1亿年左右，一颗更大的小行星可能导致物种大灭绝。大多数科学家相信一颗6英里直径的小行星在6500万年前使恐龙灭绝。
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.
如果你的狗像恐龙那么大，他的晚餐将会堆满你的卧室！
If your dog were the size of a dinosaur, his dinner would fill your bedroom!
“瞧！那些一定是恐龙蛋。他们那么大！”露茜喊到。
"Oh, look! These must be dinosaur eggs. They are so big!" Lucy shouted.
“瞧！那些一定是恐龙蛋。他们那么大！”露茜喊到。
"Oh, look! These must be dinosaur eggs. They are so big!" Lucy shouted.
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