异特龙过于关注圆顶龙被困泥中，这一点它们没有使用顶级掠食者模式。

That meant it got in too close.

就是说它们靠得太近了。

Never in its wildest imagination would it have thought that that Camarasaurus would shift its center of gravity, free those giant front feet,

异特龙无论如何也想不到圆顶龙能够改变其重心解放出其巨大的前足，

and crush that Allosaurus like it was a bug.

像踩死虫子一样踩死这头异特龙。

Camarasaurus may have triumphed over Allosaurus here.

圆顶龙胜过了异特龙。

But in the ultimate battle for survival, they and all the other dinosaurs at the lake would lose.

但是在终极生存之战中它们和其它湖边的恐龙都会失败。

At the end of the Jurassic period, something big happens and it causes the extinction of a lot of different dinosaurs.

在侏罗纪时期结束时，有一个大事件导致了很多种不同恐龙走向灭绝。

Allosaurus, Camarasaurus, Stegosaurus, Ceratosaurus are victims to this unknown killer.

异特龙、圆顶龙、剑龙和角鼻龙都是这一未知杀手的牺牲品。

It appears that global climate change was the catalyst.

看起来全球气候变化是催化剂。

When your environment changes, you've got one of three choices you can make.

当周围环境发生改变时有三种不同选择。

You can move to a place that suits you better, you can adapt to this new environment or you die.

迁移到更适合生存的地方适应新的环境否则死亡。

Science still seeks to know more about these amazing creatures who dominated the planet one hundred and fifty million years ago.

科学界仍在努力对这些奇异的生命进行更多了解，它们在一亿五千万年前是地球的统治者。

For years now, paleontologists have noticed that there seem to be different types of Allosaurus.

多年来，古生物学家注意到了似乎有三种不同类别的异特龙。

The discussion now is are we truly seeing different kinds of species that live along side each other, the way perhaps wolves and coyotes do.

要讨论的是它们真的是不同种类在同一时期并肩生存就像如今狼和郊狼那样。

Or are we seeing instead a single species that's changing across time as the environment changes and as the animals change.

还是我们看到的是一个物种在历史上的不同阶段随着环境的变化自身产生的变化。

And that's a really interesting question if we want to understand how dinosaurs in general responded to the environment.

如果我们想要明白恐龙对环境的一般反应，那么这个问题就真的很有意思。

While the search for answers continues, this much is known: during the late Jurassic, at a dry watering hole in what became Utah, an unusually high number of predatory dinosaurs died along side of their prey.

虽然我们还在寻找答案，有一点已经确认无疑：在侏罗纪晚期当时的犹他州一处干涸的水坑，异常多的掠食性恐龙与它们的猎物死在一处。

Their bones are proof of a brutal natural world where a simple drink of water could lead to a battle to the death.

它们的骨头是残暴自然世界的证据在这个世界里，一次饮水就可能引发生死大战。