In a pennaceous feather, the barbs grow helically around the tubular feather germ and fuse on one side to form the rachis.Simultaneously, new barb ridges form on the other side of the tube.
在正羽上,羽枝以螺著管状羽芽生长,在管子一侧接合在一起成羽轴,同时在管子另一侧成新羽枝脊。
In a pennaceous feather, the barbs grow helically around the tubular feather germ and fuse on one side to form the rachis.Simultaneously, new barb ridges form on the other side of the tube.
在正羽上,羽枝以螺著管状羽芽生长,在管子一侧接合在一起成羽轴,同时在管子另一侧成新羽枝脊。
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