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，羽枝以螺旋形绕著管
羽芽生长，在管子一侧接
在一起形成羽轴，同时在管子另一侧形成新羽枝脊。
词条纠错
X
有羽毛
,羽毛
,羽毛声明：以上例句、词
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相似单词
penmanship, penmate, PENN, Penn., penna, pennaceous, pennaite, pennales, pen-name, pennant,
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