Huxley speculated that a coat of hair would insulate against loss of body heat and might streamline the body to reduce drag in flight.
赫胥黎推测，一层毛发可以隔离身体热量的流失，并可能使身体呈现流线型，以减少飞行中的阻力。
2
Huxley reasoned that flying vertebrates must have been warm-blooded because flying implies a high rate of metabolism, which in turn implies a high internal temperature.