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氧气对于生命是不可缺少的。如果没有氧气,人体的细胞只能生存很短的几分钟。细胞获得供它利用的氧气,有赖于肺脏的功能和血
Oxygen is indispensable to life. Without oxygen, the cells of the human body can only survive for a few minutes. The cells gain oxygen for its use, depending on the function and blood of the lungs