通过肺与外界进行气体交换吸入空气中的氧气排出二氧化碳气体和水蒸气.但人体排出的二氧化碳气体究竟是空气中原有的还是人体代谢的最终产物为了 Template


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tomski通过肺与外界进行气体交换吸入空气中的氧气排出二氧化碳气体和水蒸气.但人体排出的二氧化碳气体究竟是空气中原有的还是人体代谢的最终产物为了 coloring