单词pennaceous
Xu calls it a "four-winged" dinosaur because it had long, pennaceous feathers on its arms and legs.
因为其前后肢上都存在着较长的羽翮，因此徐星将它称之为“四翼”恐龙。
Pennaceous feathers cover the bodies of birds, and their tightly closed vanes create the aerodynamic surfaces of the wings and tail.
正羽覆盖鸟的身体，这些紧紧靠拢的羽片，为翅膀与尾部塑造出符合空气动力学的身体表面。
There are also pennaceous feathers that obviously had differentiated barbules and coherent planar vanes, as in stage 4 of the model.
牠们身上甚至也有正羽，明显拥有分化的羽小枝和平坦的羽片，如同模型的阶段4所述。