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Marine creatures, all without backbones, from corals, to cuttlefish, to crabs,
海洋无脊椎动物 包括珊瑚，乌贼和蟹类
make up the majority of life in the oceans.
数量占海洋生物的多数
But they have also had a surprisingly important impact
但它们对海洋以外的世界 也有令人意外的
beyond the marine world.
重大影响
Their fossilised bodies, shells and skeletons
它们的尸体化石，外壳和骨骼
form the limestone and chalk that now covers huge tracts
形成石灰岩和白至 如今覆盖了
of Asia, Europe, and the Americas.
亚洲，欧洲 和美洲的大片土地
They may be small, but over their two billion-year history,
海洋无脊椎动物体型虽小 但在二十亿年的悠久历史中
they have, literally, changed the world.
它们确实改变了世界
To capture some of the sequences in this episode,
为了拍摄本集部分的画面
the Life team had to take underwater filming into uncharted territory.
“生命制作”制作团队将水底摄影 推向一个前所未有的境界
One shoot meant spending weeks diving under two metres of ice,
有一次实地拍摄，摄影小组打算花上 几个星期，潜入两公尺厚的冰层底下
another involved laying the foundation for a new coral reef in the tropics.
另一次是在热带地区 放置一个新的珊瑚礁地基
