他们吸入氧气，将糖转化成能量，并释放二氧化碳。
They're taking in oxygen to help them convert sugars into energy, and releasing carbon dioxide.
有些人则担心风扇本身将氧气分子转化成了二氧化碳。
Some fear that the fan itself converts oxygen molecules into carbon dioxide.
有些人则担心风扇本身将氧气分子转化成了二氧化碳。
Some fear that the fan itself converts oxygen molecules into carbon dioxide.
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