这个谜题的答案在于早期光合生命形式的新陈代谢活动,这种活动缓慢但一定改变了地球大气的化学成分。
The answer to this riddle lies in the metabolic activity of early photosynthetic life-forms that slowly but surely transformed the chemical composition of Earth's atmosphere.
由于细胞中缺少氧气,所以细胞不能完成,它们的各种新陈代谢活动。
Because of the lack of oxygen getting to the cells, the cells are no longer able to carry on their various metabolic processes.
大脑扫描显示了脑细胞如何把葡萄糖转化为能量这一正常的新陈代谢活动。
The scans showed how the brain cells used sugar to produce energy, a normal activity.
Because of the lack of oxygen getting to the cells, the cells are no longer able to carry on their various metabolic processes.
由于细胞中缺少氧气,所以细胞不能完成,它们的各种新陈代谢活动
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