And they happen, on average, to have a certain unique physiology: legs that are very long and very thin at their extremity, and this is because they have their ancestry at very low latitude in a very hot and dry climate, and an evolutionary adaptation to that is limbs that are very long and very thin at the extremity for cooling purposes.
他们在平均体型上， 都有着非常独特的生理特征： 极端长 和瘦的腿， 这是因为他们的祖先 生活在很低的纬度， 和非常燥热的气候下， 和一种进化性的适应： 以降温为目的的 极端长和瘦 的腿。