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These giant animals lumbered slowly across the landscape in large herds.
這些巨大的動物成群結隊，在陸地上緩慢行走
With tiny brains the size of a golf ball,
它們的腦只有高爾夫球那么大
they were neither quick-witted nor fleet-footed. They didn't need to be.
所以它們既不聰明，也不靈敏，可是它們根本不需要這些
Sheer size was their defense.
龐大的體型是最好的防御武器
Only the youngest or the sickest were at risk from smaller predators.
只有老弱病殘者才會面臨較小的掠食恐龍的威脅
The reign of the long-necks lasted for 60 million years, and then they died out; no one knows why.
蜥腳類恐龍的統治持續了6000萬年，接著它們就滅亡了，沒有人知道原因
By the end of the final age of dinosaurs, the Cretaceous Period, things were very different.
到了恐龍時代的末期——白堊紀，情況變得很不一樣
A new and more vicious species of dinosaur arrived on the scene, the massive carnivorous tyrannosaurs.
一種全新并且更為兇猛的恐龍登上了歷史舞臺，巨大的食肉霸王龍
They were enormous. They were the biggest carnivores known.
它們龐大無比，而且是已知最大的食肉動物
For the next 25 million years, these huge meat-eaters preyed upon everything around them.
在之后的2500萬年里，這種巨型食肉恐龍捕食身邊所有的動物
These giant predators never met the long-necked herbivores.
這些高大的掠食動物永遠不會碰上植食蜥腳類恐龍
But there was a part of the world where evolution took a different path... South America.
但在地球上的某個地方，進化卻走上了一條不同的道路。南美洲
Millions of years ago, when dinosaurs first appeared, all the land was connected in one huge super-continent, Pangea.
億萬年前，當恐龍剛開始出現時，所有的陸地板塊都聯結為一塊超大陸--盤古大陸
