Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
盖鸟
身体，这些紧紧靠拢片，为翅膀与尾部塑造出符合空气动力学身体表面。
毛
,毛状Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
盖鸟身体，这些紧紧靠拢片，为翅膀与尾部塑造出符合空气动力学身体表面。
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，枝以螺旋形绕著管状芽生长，在管
一侧接合在一起形成轴，同时在管
一侧形成新枝脊。
声明：以上例句、词性分类均由互联网资源自动生成，部分未经过人工审核，其表达内容亦不代表本软件观点；若发现问题，欢迎向我们指
。
