光合作用的生物在还原空气里的二氧化碳的同时也消耗氧气。

While photosynthetic life reduced the carbon dioxide content of the atmosphere, it also started to produce oxygen.

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原则上，氢可以还原二氧化碳生成酒精。

In principle, can reduce carbon dioxide to an alcohol.

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原则上，氢可以还原二氧化碳生成酒精。

In principle, can reduce carbon dioxide to an alcohol.

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