However, the bear is a kind of warm-blooded animal. It sleeps in winter just because it doesn't have enough food. Whenever it feels hungry, it will wake up to eat.
而熊是恒温动物，冬眠是由于缺少食物，一旦自身感觉到饥饿或脂肪流失，就会醒来吃食，补充能量。
However, the bear is a kind of warm-blooded animal. It sleeps in winter just because it doesn't have enough food. Whenever it feels hungry, it will wake up to eat.
而熊是恒温动物，冬眠是由于缺少食物，一旦自身感觉到饥饿或脂肪流失，就会醒来吃食，补充能量。
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