In short, the evolution of feathers would have happened along with the evolution of flight.
简而言之，羽毛的进化史是伴随着飞行的进化同时发生的。
If feathers did not evolve first for flight, what was their purpose?
如果羽毛进化的初衷并非是为了飞行，那么这种进化的意图何在？
narrow feathers and weak flight muscles suggest it was not a powerful flier.
狭窄的羽毛和柔软无力的飞翔肌暗示孔子鸟并非是个高超的飞行大师。
Feathers did, of course, eventually become an instrument of flight.
当然，羽毛最终进化成为飞翔的工具。
Feathers did, of course, eventually become an instrument of flight.
当然，羽毛最终进化成为飞翔的工具。
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