This process is known as endothermy or warm-bloodedness.

这个过程被称为温血动物的体温调节。

Which is why we think full endothermy or warm-bloodedness first arose in something small.

这也是为什么我们认为完全的内温或者温血状态一开始会出现在小型生物体上。

Within its first year of life, it develops something known as regional endothermy — the ability to regulate its body temperature.

在它的第一年里，它学会了一项本领——局部体温调节，它可以调节自身体温。

We do, at least, have a sense of when endothermy evolved in birds.

至少，我们确实了解鸟类何时进化出吸热行为。

And warm-blooded animals use this heat in what's known as endothermy.

温血动物将这种热量用于所谓的吸热。

So finding respiratory turbinates in a skull is widely considered to be evidence of endothermy.

因此，在头骨中发现呼吸鼻甲骨被广泛认为是吸热的证据。

Well, modern birds can tell us some interesting things about the origins of endothermy.

好吧，现代鸟类可以告诉我们一些关于吸热起源的有趣事情。

They said the ear canals showed that warm-bloodedness, or endothermy, appeared around 233 million years ago, millions of years later than some previous estimates.

他们表示，耳道表明温血动物出现在大约2。33亿年前，比之前估计的数值晚了数百万年。

But experts think it may one day tell us a lot about what mechanisms could be at play in the evolution of endothermy.

但专家认为，有一天它可能会告诉我们很多关于吸热进化过程中可能发挥作用的机制。

So another way to learn about dinosaurs' metabolism is to look for anatomical features in their fossils that we know are related to endothermy.

因此，另一种了解恐龙新陈代谢的方法是在它们的化石中寻找我们知道与吸热有关的解剖学特征。

He argued that birds descended from dinosaurs, and that many features associated with birds -- active lifestyles, agility, and most importantly, endothermy -- got their start in an ancient creature that probably looked like Deinonychus.

他认为鸟类是恐龙的后裔，并且与鸟类相关的许多特征——活跃的生活方式、敏捷性，最重要的是恒温性——起源于一种可能看起来像恐爪龙的古老生物。