Precambrian animals must therefore have lived at such depths.

因此，前寒武纪的动物肯定曾经生活在这么深的地方。

These findings are not of Precambrian animals themselves, but of their tracks.

发现的并不是寒武纪前的动物本身，而是它们的足迹。

But some might be the ancestors of the Cambrian megafauna.

但是他们中的一些可能就是寒武纪大型动物的祖先。

The fall of the Ediacaran fauna was followed by the creative outburst of the Cambrian period.

埃迪亚卡拉动物群的后是寒武纪的创造性爆发。

In the context of the Cambrian, explosion would soon have more to do with modern tempers than ancient physiological facts.

联系到寒武纪的氛围，“爆发”很快跟现人的脾气，而不是跟古生理上的事实更有关系。

Back in the Cambrian, new phyla and new classes arose. Nowadays we only get new species!

而在寒武纪，新的门和新的纲不断产生。如今我们只有新的种！”

A billion years after that, 3.5 billion years after life started, is the extraordinary Cambrian explosion.

10亿年后， 也就是生命开始后35亿年，是非凡的寒武纪大爆发。

The schoolboy turned it in to a paleontologist at the University of Leicester, who identified it at once as Precambrian.

那位小学生把化石交给了莱斯特大学的一位古生物学家。他马上认出那是寒武纪前的东西。

Early Cambrian eocrinoids stuck lightly to sediment or just rested on it while suspension-feeding.

寒武纪早期的类分泌物轻轻地粘在沉积物上，或者只是在悬浮喂养时停留在沉积物上。

But by 508 million years ago, during the height of the Cambrian, the Animal kingdom was running riot.

但到了 5.08 亿年前， 在寒武纪的鼎盛时期，动物王国正处于暴乱状态。

On the further verge of the Cambrian rose the crystalline rocks from which every trace of organic existence had been erased.

在寒武纪更远的边缘， 出现了水晶般的岩石， 所有有机存在的痕迹都被抹去了。

The pattern that we saw in the Cambrian, of a long period nothing happeningand then a burst, is here right now.

我们在寒武纪看到的模式，即很长一段时间有发生， 然后突然爆发，现在就在这里。

And yet the first echinoderms had no arms - not just Ctenoimbricata, but other species from the Cambrian Period, too.

然而， 第一批棘皮动物有手臂——不仅是棘皮动物，寒武纪的其他物种也是如此。

It's as if, at one instant in this time we call the Cambrian Era, complex multi-cellular life suddenly emerged almost intact on the planet.

在寒武纪的一段很短的时间里，各种复杂的多细胞生物突然横空出世。

Communities of priapulids and other similar organisms changed the seafloor from hard matgrounds to the softer sediment found in the Cambrian.

priapulids 和其他类似生物群将海底从坚硬的地垫变为寒武纪较软的沉积物。

Between 535 and 520 million years  ago, a new kind of biological litter began collecting in the ancient  oceans of the Cambrian period.

535 至 5.2 亿年前，一种新型生物垃圾开始在寒武纪的古海洋中聚集。

This then enabled the rise of carnivores, which in turn spurred a productive arms race, resulting in what's known as the Cambrian explosion.

这就促成了食肉动物的出现，它们激起了一场繁殖力的竞赛，最后演变为我们所知的寒武纪大爆发。

But then, a chance discovery changed everything, effectively erasing what experts thought was the Cambrian Extinction.

但随后， 一个偶然的发现改变了一切，有效地消除了专家们认为的寒武纪灭绝。

Seaweeds, jellyfish-like creatures, sponges and the odd worm do start to put in an appearance a few million years before the Cambrian begins.

海藻、类似水母的生物、海绵生物和奇怪的虫子确实在寒武纪开始的前几百万年已经出现。

He told the Associated Press it is believed that " … modern animal groups like jellyfish appeared 540 million years ago in the Cambrian explosion."

他告诉美联社，据信“… … 诸如水母类的现动物群体出现在5。4亿年前的寒武纪大爆发期间。”