So perhaps the scales of the birds' ancestors had stretched out, generation after generation. Later their edges could have frayed and split, turning them into the first true feathers.

鳞片和羽毛都是扁平的，因此有可能鸟类祖先的鳞片经过多代繁衍之后渐渐延展开来，之后其边缘出现绽裂和缺口，于是鳞片进化成为第一缕真正意义上的羽毛。

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So perhaps the scales of the birds' ancestors had stretched out, generation after generation. Later their edges could have frayed and split, turning them into the first true feathers.

鳞片和羽毛都是扁平的，因此有可能鸟类祖先的鳞片经过多代繁衍之后渐渐延展开来，之后其边缘出现绽裂和缺口，于是鳞片进化成为第一缕真正意义上的羽毛。

youdao