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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.

上,枝以螺旋绕著管状的芽生长,在管子的侧接合在轴,同时在管子的另成新的枝脊。

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Bird feathers have highly water-resistant parts called the pennaceous barb, which stops the water from actually going in and soaking the rest of the bird.

鸟儿的羽毛具有高度防水的部,叫做羽状倒钩,它可以阻止水进泡鸟的其余部

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3G, 401(K), a,
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