在代谢过程中，将脂肪细胞转换为能量要求氧气存在。
The metabolic process that converts fat cells to energy requires the presence of oxygen.
人体无法控制代谢过程中所消耗的热量，但可以控制吃入食物的品种与数量，以及在体力活动中消耗多少热量。
People cannot control the calories expended in metabolicprocesses, but they can control what they eat and drink, as well as how manycalories they use in physical activity.
在缺乏水分时，(植物)一般用蒸发作为降温的手段。一株植物无法消除它从阳光中所吸收的热量，或是无法消除它在新陈代谢过程中积累起来的热量。
When it is short of water, a plant, which normally USES evaporation as a means of cooling, cannot rid itself of the heat it absorbs from sunlight or the heat that may build up from its own metabolism.
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