有很多计算方式可以根据你的身高，体重，还有活动系数给你一个基础代谢率。那就是，你每天所需要的热量。
There are many calculators available that take your weight, height and level of activity and give you a fairly accurate idea of your daily calorie need.
你的代谢率可能会逐天改变，这取决于你的活动水平，但是你基本的代谢率保持相当平稳。
Your metabolic rate might change from day to day depending on your activity level, but your basal metabolic rate stays fairly steady.
例如，小动物较高的新陈代谢率，以其体重的每单位计算均能赋予动物以持续不断的能量和活动能力，但其代价是，要求它们不间断地消耗水和食物。
The high metabolic rate of small animals, for example, gives them sustained power and activity per unit of weight, but at the cost of requiring constant consumption of food and water.
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