They are like the cold-blooded animal the fish, but they again like the mammal chief of the general staff the lung.
它们是像鱼一样的冷血动物，但它们又像哺乳动物一样总长着肺。
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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