billion

37 篇文章
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

took than trees make more it four for to billion years
They reveal nearly two billion years of the earth's history.
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They reveal nearly two billion years of the earth's history. 它们揭示了近二十亿年的地球历史

reveal history earth's nearly two they of the billion years
Nearly four billion years later,
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Nearly four billion years later, 近四十亿年后的今天

later nearly four billion years
That have succeeded one another on earth over nearly four billion years.
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That have succeeded one another on earth over nearly four billion years. 无数生命链上的一环

succeeded another nearly four that have over earth on billion one years
Appeared around four billion years ago,
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Appeared around four billion years ago, 起源于四十亿年前

appeared around four billion ago years
15 billion trees
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15 billion trees 每年多达150亿颗树

trees billion
For 3.8 billion years,
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For 3.8 billion years, 38亿年来

for billion years
where life on Earth first began four billion years ago.
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where life on Earth first began four billion years ago. 生命正是起源于类似这样的喷口

began life where first four earth on billion ago years
Over 300 billion tonnes of ice are melting...
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Over 300 billion tonnes of ice are melting... 超过3000亿吨的冰正在融化

melting tonnes ice of are over billion
Four billion human beings now live in the urban environment.
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Four billion human beings now live in the urban environment. 四十亿人口现在居住在城市环境中

urban environment live beings human four in the now billion