但是前寒武纪时期却不是腥牙血爪,因为那个时候牙齿和爪子都没有出现。
Then, in the 20m-year blink of a geological eye, animals arrived in force.
然后,在地质学看来一眨眼的2000万年中,动物大规模的出现了。
Most of the main groups of the animal kingdomarthropods, brachiopods, coelenterates,echinoderms, molluscs and even chordates, the branch from which vertebrates went on todevelopare found in the fossil beds of the Cambrian.
人们在寒武纪群落里发现了动物王国的主要动物集群,包括腕足、腔肠、棘皮、软体和脊索。
The sudden evolution of this megafauna is known as the Cambrian explosion.
寒武纪因威尔士的群山而得名,
But two centuries after it was noticed, in the mountains of Wales after which the Cambrianperiod 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。
A group of Chinese scientists, led by Zhu Maoyan of the Nanjing Institute of Geology andPalaeontology, plan to change that with a project called From the Snowball Earth to theCambrian explosion: the evolution of life and environment 600m years ago.
由南京地质古生物研究所的朱茂炎领导的中国科学家小组计划通过一个名为从雪球事件到寒武纪大爆发:距今6亿年前后的生物与环境演变的项目改变这种情况。
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