他两年前来到那里。
Microbes may have sucked enough greehouse gasses out of the atmosphere to trigger two "mother of all ice ages" at 2.3 billion years ago and again at 700 million years ago.
微生物可能已经从空气层中吸收了足够的温室气体，从而引发了23亿年前的两次“最原始的冰河世纪”。 第二次冰河世纪大概是7亿年以前。
Microbes may have sucked enough greehouse gasses out of the atmosphere to trigger two "mother of all ice ages" at 2.3 billion years ago and again at 700 million years ago.
微生物可能已经从空气层中吸收了足够的温室气体，从而引发了23亿年前的两次“最原始的冰河世纪”。 第二次冰河世纪大概是7亿年以前。
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