Cold-blooded animals were used to test this hypothesis.
冷血动物被用来验证这一假设。
If true, though, why did cold-blooded animals such as snakes, lizards, turtles, and crocodiles survive the freezing winters and torrid summers?
如果这是真的，那么为什么像蛇、蜥蜴、乌龟和鳄鱼这样的冷血动物能在寒冷的冬天和炎热的夏天存活下来呢？
Warm-blooded animals, like humans and dogs, spend much of their energy generating heat to keep the body warm.
恒温动物，如人类和犬只，通过消耗大部分的能量产生热量来保持身体的温暖。
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