肿瘤细胞似乎很适应糖酵解作用，因此即使某个肿瘤内形成了血管并获得氧气，但肿瘤细胞仍继续利用糖酵解供能。
Cancer cells seem to adjust so well to glycolysis that even if blood vessels do grow into a tumour and the oxygen thus returns, they stick with it.
头盔内有氧气循环流动，除了供氧，还可以防止面罩雾化。
Oxygen is circulated around the helmet to stop the visor misting.
背包里有氧气供航天员呼吸，并且可以排除航天员呼出的二氧化碳。
The backpack supplies pure oxygen for the astronaut to breathe, and gets rid of the carbon dioxide he or she gives out.
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