Animals that maintain a constant body temperature year-round as true endotherms do grow rapidly even when the environment becomes cool.
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。
Through lots of experiments, the optimum contrast temperature difference between hot environment and cool environment is given.
并根据大量的实验给出冷热环境温差的优化值。
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