若人体与环境达成热平衡，以保持体温恒定，就谓之具有热舒适性。
Thermal comfort exists if the human body in thermal equilibrium with its environment, implying a constant temperature of the body.
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.
但生活在深海中的无脊椎动物就就无需调整体温，可以保持体温恒定。
Furthermore many invertebrates live in the depth of the ocean never experience a change in the chill of deep water, their body temperatures remain constant.
现在，一项最新的研究发现，我们和其他很多哺乳动物之所以维持在一个恒定的体温，是因为我们要维持的正好是黄金温度——98.6度。
Well, a new study finds that we and many other mammals keep up such a torrid temp because it's a Goldilocks situation-98.6 is just right.
它们的视力非常好。它们有恒定的体温。
Their eyesight is very good. They have a constant body temperature.
当环境温度低于热中性区时，单独的个体不能维持较高的恒定体温。
When ambient temperature falls below the thermal neutral zone, isolated young cannot maintain high constant body temperatures.
主要的特征是：体温不恒定；…
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.
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.
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