Likewise, a plumulaceous tuft of barbs evolved before the pennaceous feather with a rachis because the rachis is formed by the fusion of barb ridges.
英
美
释义
同样的,绒羽的羽枝簇比拥有羽轴的正羽更早演化出来,因为羽轴是由羽枝脊接合而成。
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