But it would take you twenty years to reach the dawn of the Cambrian period.

但是，你要花上20年的时间才能抵达寒武纪初期。

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没落之后是寒武纪的创造性爆发。

AMONG the mysteries of evolution, one of the most profound is what exactly happened at the beginning of the Cambrian period.

在众多进化之谜中，其中意义最深远的就是在寒武纪开始时期到底发生了什么。

Let's start about 540 million years ago, just before the dawn of the Cambrian period.

让我们从大约 5.4 亿年前开始，就在寒武纪黎明之前。

But two centuries after it was noticed, in the mountains of Wales after which the Cambrian period is named, nobody knows what detonated it.

在寒武纪被注意到的两个多世纪里，没人知道到底为什么会发生大爆炸。

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代海洋中聚集。

I joked in one of my books that I felt as if I ought to put a safety helmet on before writing about the Cambrian period, but it did actually feel a bit like that.

我在一本书里开玩笑说，我觉得在写到寒武纪的事之前应当先戴个安全帽，不过我就是有点儿这样的感觉。”