One of the greatest mysteries of the history of life is the cambrian explosion .

寒武纪的大爆炸是生命史中最大的谜团之一。

During the cambrian explosion , major paradigm shifts took only tens of millions of years .

在寒武纪生命大爆发期间，主要模式转化只用了数千万年的时间。

The ediacaran fossil record thus stretches the origins of animals to well before the cambrian explosion .

埃迪卡拉化石的发现，将动物的形成时间从寒武纪又推早了不少。

During the cambrian period , 500 million years ago , worm-like creatures were evolving into fish-like creatures .

在5亿年前的寒武纪，似蠕虫生物逐渐演化成似鱼生物。

Animals - including human beings - trace their origins back to the oceans of the cambrian period more than half a billion years ago when the first multicellular organisms that fed exclusively on onther living things appeared .

动物----包括人类---起源于10亿年前寒武纪时代的海洋，那时出现了第一个多细胞生物，它只靠吃其他已出现的生物为生。