Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
覆盖鸟的,这些紧紧靠拢的片,为翅膀与尾部塑造出符合空气动力学的面。
Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
覆盖鸟的,这些紧紧靠拢的片,为翅膀与尾部塑造出符合空气动力学的面。
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.
在上,螺旋形绕著管状的芽生长,在管子的一侧接合在一起形成轴,同时在管子的另一侧形成新的脊。
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