If he didn't find a shelter, his body temperature would get very low, which could quickly kill him.
如果他没有找到庇护所，他的体温会变得很低，最终会让他致命。
Sleeping longer than you need to will weaken your sleep system, as you reduce your prior wakefulness, exposure to sunlight, activity levels, and your body temperature at a low for too long.
睡得比你所需应该睡的时间长了会减弱你的睡眠系统，当你降低了你先前的觉醒度，暴露于阳光中，你的活动水平和你的身体体温都处于低水平太久。
A body of low temperature radiates energy less rapidly than the one at higher temperature.
低温物体不象温度较高的物体那么快地辐射出能量。
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