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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.

在正上，枝以绕著管状芽生长，在管侧接合在起成轴，同时在管另侧成新枝脊。

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原声例句
连线杂志

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.

鸟儿的毛具有高的部，叫做钩，它可以阻止进入并浸泡鸟的其余部。

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appestat, appetence, appetency, appetent, appetiser, appetising, appetite, appetitive, appetizer, appetizing,

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