and

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including insects, spiders, and crabs,
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including insects, spiders, and crabs, 包括昆虫、蜘蛛和螃蟹

Unlike jellyfish, Anomalocaris can swim with both direction and pace.
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Unlike jellyfish, Anomalocaris can swim with both direction and pace. 与水母不同 奇虾游速快且方向准确

And in the tropical shallows 508 million years ago,
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And in the tropical shallows 508 million years ago, 在5.08亿年前的热带浅海中

And in these waters,
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And in these waters, 在这些水域中

And its breakthrough adaptation, armor.
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And its breakthrough adaptation, armor. 它的突破性适应特征就是护甲

and into the big blue.
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and into the big blue. 进入巨大的蓝色海洋

And they are so abundant
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And they are so abundant 而且它们的数量如此之多

they were the very first animals to escape the seafloor and swim.
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they were the very first animals to escape the seafloor and swim. 它们是第一种从海底逃离 并开始游泳的生物

And one group adapted in a way never seen before.
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And one group adapted in a way never seen before. 有一群生物以前所未见的方式 适应了这种转变

and can't hide forever.
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and can't hide forever. 无法永远隐藏