helically grilled tube
伸缩管, 管
helically grilled tube
伸缩管, 管
helically welded tube
螺旋缝焊管
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.
正上,以螺旋形绕著管状芽生长,管子一侧合一起形成轴,同时管子另一侧形成新脊。
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