Shelly creatures such as trilobites and brachiopods, of whose ancestors there is little sign in the rocks, are suddenly everywhere.

像叶虫、腕足动此般壳类动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。

These creatures were among the first to harness the light that filled the universe.

叶虫属于最早一批能够利用光的。

Trilobite and dinosaur fossils have been unearthed in many places.

多处出土叶虫恐龙化石等。

One hundred million years later, the warm, shallow seas were packed with tiny plants and animals — essentially, hors d'oeuvres for a plethora of bigger creatures like trilobites, conodonts, brachiopods, and corals.

一千万年之后，温暖的浅海充满了微小的植和动——基本上是大量大型的开胃菜，如同叶虫，牙形虫，腕足类和珊瑚。

A single-file line of traveling trilobites, all facing the same direction, were caught in a sediment avalanche 480 million years ago.

科学家在4.8年前发的沉淀雪崩中，发现了一排面朝同一方向迁徙的叶虫。

From about five hundred million years ago, big creatures became much more common, from trilobites to trees to tyrannosaurus rex.

从大约五年前开始，大型变得更加常见，从叶虫到树木再到雷克斯霸王龙。

Trilobite diversity dwindled, and come about 360 million years ago, only one of the 10 former trilobite orders remained.

叶虫的多样性减少，到了千万年前，过去所有的叶虫目中，只有十目存活下来。

Fortey found his first when he was a boy clambering over rocks at St. David's Bay in Wales.

福泰在孩提时代就发现了第一个叶虫化石，当时他正攀越威尔士圣戴维海湾的岩壁。

It's Earth about 500 million years ago, when these creatures, called trilobites, prospered.

这是大约五年前的地球，这种叫做叶虫，当时地球是它们的天下。

All shared a basic body plan of three parts, or lobes-head, tail, thorax-from which comes the name.

叶虫的身体都有个相同的基本结构，分为个部分或片叶——头、尾和胸。叶虫的名字由此而来。

But his first love is a type of marine creature called trilobites that once teemed in Ordovician seas but haven't existed for a long time except in fossilized form.

但是，他最钟爱的是一种名叫叶虫的海动。那种动一度充满奥陶纪的海洋，但早已不复存在，除了以化石的形式。

We've found trilobite fossils on every single continent — many in unlikely environments that were once part of the ocean floor.

我们在每一个大陆上都发现了叶虫化石——许多发现地都曾经是海底，原以为是不太可能有叶虫踪影的地方。

No one could persuasively explain how it had managed to cross two thousand miles of hostile ocean, but then failed to find its way around the corner of a 200-mile-wide island.

谁也无法令人信服地解释，叶虫怎么能跨越3000公里的汹涌大海，却又绕不过那个300公里宽的岛角。

Like modern arthropods, trilobites had compound eyes composed of many tiny lenses.

就像现代的节肢动，叶虫也有由许多小晶体组成的复眼。

For almost all of Earth's history before the rise of the trilobites, life had mostly consisted of microscopic marine organisms.

根据地球的历史，在叶虫兴起之前，命几乎都是海洋里的显微有机体。

Trilobites have no direct descendants, but their evolutionary cousins are alive and well.

叶虫没有直系的后代，但它们在演化上的表亲现在仍然活得很好。

At 9: 04 P.M. trilobites swim onto the scene, followed more or less immediately by the shapely creatures of the Burgess Shale.

晚上9点4分，叶虫登场了，几乎紧接着出场的是布尔吉斯页岩那些形状美观的动。

Finding a complete trilobite fossil is still a big moment for a paleontologist.

发现一块完整的叶虫化石对古学家来说，仍是一件大事。”

And, as the earliest known animals with complex eyes, trilobites had a unique perspective on the ancient world.

叶虫也是目前所知最早具有复眼的动，它们对古老的世界有着独特的视角。

With so much time at their disposal, the trilobites proliferated prodigiously.

叶虫有那么漫长的支配时间，因此数量激剧增加。