真正的恒温动物可以一年四季保持恒定的体温，因此可以在天气很冷的情况下快速生长。
Animals that maintain a constant body temperature year-round as true endotherms do grow rapidly even when the environment becomes cool.
恒温动物是指诸如现代鸟类和哺乳动物这种可以保持体温恒定的动物。
Endotherms are animals such as modern birds and mammals that keep their body temperatures constant.
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