大树为我们提供荫蔽、制造氧气，让我们享受大自然的美丽。
不过，事实仍然是，仅仅改变氧气浓度一项指标，蜻蜓的体型就自然增大了。 遗憾的是，我们不能把这些巨型蜻蜓放到野外去对付那些致人死命的蚊子。
Still, the fact remains that a simple change in oxygen levels produced naturally giant dragonflies--too bad we can't release them into the wild to take care of those deadly mosquitoes .
的突变也阻止了细胞的生产压力颗粒，氧气水平低的压力造成的神经元的自然防御。
The mutations also prevented the cells from producing stress granules, the neurone's natural defence from stress caused by low oxygen levels.
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