frayed feathers
磨损的羽毛
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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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