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In a world of terrifying creatures, being small means facing danger at every turn.
在恐怖生物林立的世界里，渺小就意味著危機四伏。
If you were a small animal, the Late Cretaceous would have been an awful time to be around.
如果你是小型生物，那白堊紀(jì)晚期將會是一個可怕的時期。
For a youngster, every day is a struggle to stay alive.
對于幼獸來說，每天都是一場生存的斗爭。
Their only chance is to keep out of trouble and grow up fast.
它們唯一的機會就是遠(yuǎn)離危險，快速成長。
If you're a Tyrannosaur, every mega-herbivore in the environment wants to crush you.
如果你是頭霸王龍，周圍的每只大型食草恐龍都想將你踩死。
Dinosaurs develop advanced tools to survive, astonishing on the outside and on the inside.
為了生存，恐龍進(jìn)化出了先進(jìn)的生理機能，無論其內(nèi)在還是外表都非常驚人。
And now, 65 million years on, cutting-edge imaging technology will peel back skin, muscles, and bones to reveal the secrets of nature's greatest success story.
而現(xiàn)今，6500萬年之后，先進(jìn)的成像技術(shù)將會重塑肌膚，肌肉和骨骼來揭示這自然界最成功故事背后的秘密。
The largest dinosaurs grow as tall as a six-story building and weigh 50 tons or more. No land animal today even comes close.
最龐大的恐龍能長到六層樓那么高，體重達(dá)到50噸以上。如今的任何陸生動物都無法與之比肩。
The jaws of a T. Rex can leave a bite mark over a meter long. And 13 centimeter teeth can penetrate deep into flesh.
霸王龍的顎部可以留下一米長的咬痕。而它13厘米長的獠牙可以深深刺入血肉當(dāng)中。
But every dinosaur, no matter how big or powerful, begins life very small.
但每一只恐龍無論有多么龐大或強壯，出生的時候都是小不點。
Oklahoma. 110 million years ago. A herd of Sauroposeidon dinosaurs are on the move.
俄克拉何馬州。一億一千萬年前。一群波塞東龍正在遷徙。
We're talking about an animal who's probably 80 or 90 feet long. And about 40 feet of that was just neck.
我們討論的這種動物很可能有80或90英尺長。而其中有40英尺都是脖子。
So when it stuck its neck straight up, it could probably reach about 60 feet up in the air.
所以當(dāng)它把脖子豎起來的時候可能會有60英尺那么高。
