helically grilled tube
伸缩, 连接弯
helically grilled tube
伸缩, 连接弯
helically welded tube
螺旋缝焊接
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.
,枝以螺旋形绕著状的芽生长,子的一侧接合一起形成轴,同子的另一侧形成新的枝脊。
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