translation.en: So therefore, they must have something within their DNA that ables them to deal with the metabolic stresses, particularly of flight. They expend three times more energy than a mammal of the same size, but don't seem to suffer the consequences or the effects.
translation.zh: 所以他们的DNA里面一定有某种东西， 能让它们处理代谢的压力。 尤其是飞行引起的代谢压力。较那些同等大小的哺乳动物而言， 飞行需要三倍有多的能量， 但蝙蝠似乎没有受到飞行的影响。