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为什么人会需要呼吸？

人类通过呼吸来获取身体所需的氧气，并排出体内的二氧化碳。呼吸是维持生命的基本生理需求，因为身体的细胞需要氧气来进行新陈代谢和能量产生。同时，呼出的二氧化碳是身体代谢废物，不及时排出会影响身体的正常功能。所以，人们每时每刻都在进行呼吸，即使在睡觉时也保持着呼吸的循环。

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