it

2731 篇文章
It still is for one person in four-
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It still is for one person in four- 这仍旧是世界上四分之一的人类

It was the story of humankind for thousands of years.
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It was the story of humankind for thousands of years. 这是几千年来人类一成不变的经历

It was a considerable leap in human history.
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It was a considerable leap in human history. 这是人类历史上质的飞跃

Turning it into wood and leaves,
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Turning it into wood and leaves, 并将其转化成了木头及树叶

They store it and feed off it,
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They store it and feed off it, 他们将光能储藏起来 以此为生

It took more than four billion years for it to make trees.
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It took more than four billion years for it to make trees. 它花了40亿年造出树木

It forms a protective mantle against the cold,
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It forms a protective mantle against the cold, 它形成了抵御寒冷的保护性掩体

That water deploys when it freezes.
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That water deploys when it freezes. 水的分布痕迹

It takes a liquid form as running water,
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It takes a liquid form as running water, 液态是流水

Which enabled it to break apart the water molecule...
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Which enabled it to break apart the water molecule... 这使它能够分解水分子