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In many ways the late Jurassic is really the golden age of dinosaurs.
從許多方面來講，晚侏羅世都可以算是恐龍的黃金時期
We have a tremendous diversity of different kinds of dinosaurs, meat-eaters and plant-eaters, forms with armour.
各種各樣的恐龍種類非常之多，食肉恐龍、植食恐龍、有盔甲的恐龍
All around the world we see these dinosaurs.
世界各地都能見到這些恐龍
But it wasn't just the variety of dinosaurs that made this their golden age.
可是它成為恐龍的黃金時代并不只是因為種類繁多
The late Jurassic was also the era of the giants.
晚侏羅世還是巨龍的時代
We have dinosaurs of tremendous size, we have plant-eaters 40ft tall,
我們發(fā)現(xiàn)了體型極其龐大的恐龍，有40英尺高的植食恐龍
we have animals that must have weighed 50 or 60 tons,
有重達50～60噸的恐龍
so these are immense animals and they're everywhere.
所以那時有許多巨型恐龍，它們遍布世界各地
But the dinosaurs didn't start off like this.
不過恐龍剛登場時可不是這樣
50 million years earlier in the early Jurassic they were very different.
在5億年前的早侏羅世，它們非常不同
We have many fewer different kinds of dinosaurs, they're relatively primitive looking dinosaurs
恐龍的種類數(shù)非常少，它們是長相比較原始的恐龍
and compared to what we see in the late Jurassic, they're much less spectacular animals.
與晚侏羅世的那些恐龍相比，這些動物就相形見絀了
We don't see the sizes and shapes and diversities that we see at that time.
我們沒有見到與這個時期一樣的體型、模樣和多樣性
They're relatively dull looking animals compared to what we see later.
與我們后來見到的那些相比，這些動物顯得很不起眼
And there was nothing to suggest that these early dinosaurs would grow and diversify to so completely dominate the planet for so long.
沒有什么能解釋這些早期恐龍如何壯大并多樣化，成為長久以來地球上的霸主。
