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.
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.
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