氧气在细胞呼吸的新陈代谢过程中是必不可少的，它能使细胞有效地从有机食物中获取能量。
Oxygen is essential for the metabolic process known as cell respiration that allows cells to efficiently harvest energy from organic food.
新陈代谢是宇宙间普遍的永远不可抵抗的规律。
The supersession of the old by the new is a general, eternal and inviolable law of the universe.
然而，考虑到大型动物先天的新陈代谢效率，其贡献不可低估。
However, their contributions cannot be underestimated, considering the inherent metabolic efficiency of the large animals.
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