人通过肺与外界进行气体交换吸入空气中的氧气排出二氧化碳和水蒸气但人排出的二氧化碳究竟是空气中原有的还有人体代谢的最终产物为了证实这个 Template




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tomski人通过肺与外界进行气体交换吸入空气中的氧气排出二氧化碳和水蒸气但人排出的二氧化碳究竟是空气中原有的还有人体代谢的最终产物为了证实这个 coloring