- 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 - Despite being single animals,
尽管是单独个体的动物 - they were able to separate into layers of individuals,
但还是能够分离成数层个体层 - that then broke free.
然后独♥立♥出来 - Jellyfish.
那就是水母 - 530 million years ago,
5.3亿年前 - 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
that then broke free. 然后独♥立♥出来
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