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The ocean. The largest habitat on Earth,
海洋是世上最大的栖地
and an inhospitable place for those of us who live on land.
对陆地动物来说 却是无法居住之处
Yet, for a billion years,
但有十亿年之久
this was the only place on the planet where life existed.
海洋是地球唯一有生命的所在
Today, descendants of those early life forms
那些早期生物的后代
continue to thrive.
活跃至今
They share the sea with fish, but outnumber them by ten to one.
它们跟鱼类共享大海 但数量超出十倍
They have no backbones,
它们没有脊椎
and have evolved into countless different forms.
而且演化出无数型态
Some are huge, large-brained and intelligent.
有些体型惊人 拥有巨大脑部和高度智慧
Others are minuscule,
有些极为细小
yet build the largest natural structures on the planet.
但建造出世上最大的自然结构
