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为什么人可以呼吸？

人之所以可以呼吸，是因为在我们的身体中有一个复杂的系统，包括肺部、呼吸肌肉和呼吸控制中枢。当我们吸入空气时，它会通过鼻子或嘴巴进入气道，然后到达肺部。肺部中的气体与血液中的气体进行交换，将氧气吸收到血液中，并将二氧化碳排出体外。这个过程通过呼吸肌肉的运动来完成，其中膈肌和肋骨肌起着重要的作用。

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