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Palaeontology Do the locomotion 古生物学 活动活动 The earliest animal tracks yet found have been unearthed in Canada 在加拿大出土了迄今为止发现的最早动物足迹 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。 Prior to 560m years ago, animal fossils are rare. 5.6亿年以前的动物化石寥寥无几。 Then, in a geological eyeblink, they become common. 然而，只过了地质史上一瞬间的功夫，它们便多得不足为奇了。 Shelly creatures such as trilobites and brachiopods, of whose ancestors there is little sign inthe rocks, are suddenly everywhere. 像三叶虫、腕足动物此般壳类动物的祖先没有在岩层中留下什么痕迹，但它们的遗迹却突然间比比皆是。 Biologists would dearly love to know what happened. 生物学家们迫不及待地想知道当时到底发生了什么。 Recent discoveries at the delightfully named Mistaken Point, in Newfoundland, serve to lift theveil slightly. 纽芬兰岛上有个地方名字很有趣，叫错误点，正是最近在这里的一些发现轻轻掀起了这个神秘面纱的一角。 | 
