Because we sweat to cool ourselves off, starting with a lower body temperature means less need to sweat.

出汗可以冷却我们自己，因此如果体温较低的话，对汗水的需求也会比较少。

And just slightly higher at 13.7 degrees is the lowest body temperature a living human has ever had.

稍微高一点，到 13.7 度，是人类曾有过的最低体温。

This, in turn, helps them avoid a dangerously low body temperature.

反过来，这有助于他们避免危险的低体温。

Low body temperature can slow brain activity, breathing, and heart rate.

低体温会减慢大脑活动、呼吸和心率。

Why? Well, even though they are mammals, they have relatively low body temperatures, and that might make it hard for the rabies virus to survive in opossum. Now, that's random.

为什么? 嗯, 即使作为哺乳动物, 它们的体温也相对较低, 这就使得狂犬病毒在负鼠体内很难生存。现在这只是偶然所致。