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。
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。
Fishing nets often trap3 dolphins underwater. The animals drown because they cannot return to the surface to breathe.
渔网常将海豚困在海里，致使海豚无法游回到海面呼吸而溺毙。
Fishing nets often trap3 dolphins underwater. The animals drown because they cannot return to the surface to breathe.
渔网常将海豚困在海里，致使海豚无法游回到海面呼吸而溺毙。
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