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大家好，我是姚月光。为什么天冷时身体会发抖？天冷时，身体会不自觉地颤抖，也就是人们常说的打冷战。这是人体的自我保护机制，目的是为了产生热量。当皮肤表面温度下降，刺激神经发出信号，肌肉就会强烈收缩，让身体内部的重要区域始终保持在三十七摄氏度左右。
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