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.
高温加热时， 石灰石和白云石将发生煅烧，并释放二氧化碳。
When heated to high temperature, they undergo calcination, releasing carbon dioxide.
它们消耗二氧化碳，并释放氧气。
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