Divers also carry extra oxygen because they cannot breathe under water.

由于水下不能呼吸，潜水员也携带额外的氧气。

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The air at high altitudes does not have enough oxygen to supply the body's needs. Divers also carry extra oxygen because they cannot breathe under water.

在高空，空气含氧不足，无法供应身体需要。由于水下不能呼吸，潜水员也携带额外的氧气。

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Even in health people cannot repeatedly breathe air in which they live with impunity, on account of its becoming charged with unwholesome matter from the lungs and skin.

即使是健康人也不可能一直呼吸他房间里的空气而不得病的，因为屋内的空气会因为肺部和皮肤的排泄物而变得越来越不健康。

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Only a handful of people know this about me, but five years ago, my father died of amyotrophic lateral sclerosis, or ALS. This is a fatal disease that literally eats away at a person's muscles until they cannot walk, talk or even breathe.

NPR: Inner Strength from Desperate Times