We've evolved to be good at maintaining a warm body temperature.

我们已经进化为善于保持温暖的体温。

This is because we're mammals-we're warm-blooded. We've evolved to be good at maintaining a warm body temperature.

这是因为我们是哺乳动物——我们是温血动物(恒温动物)。我们经过进化，变得很擅长维持温暖的体温。

A warmer body makes it harder for bacteria and viruses to reproduce and spread because they’re temperature-sensitive.

温暖的身体使细菌和病毒更难繁殖和传播，因为它们对温度敏感。