然而，羽毛的稀疏分布也使得皮肤表面形成相当大量的侧向空气流动，从而可以通过对流进一步散热。

The sparse distribution of the feathers, however, also allows considerable lateral air movement over the skin surface, thereby permitting further heat loss by convection.

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根据传统理论，鳞片变成羽毛的第一步是先拉长，接著长出流苏般的边缘，最后产生有小钩与沟槽的羽小枝。

According to this scenario, scales became feathers by first elongating, then growing fringed edges, and finally producing hooked and grooved barbules.

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但更进一步的检查表明这其实是骨骼和软组织，上面覆盖著精美的羽毛。

But closer inspection showed that it was actually bone and soft tissue covered with delicate feathers.

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