最原始的羽毛是单纤维，类似于刚毛，从爬行动物的皮肤上突出来。
Feathers in their most primitive form were single filaments, resembling quills, that jutted from reptilian skin.
动物身体硬而尖锐的部分或附属肢体；如豪猪的刚毛或鱼鳍的骨脉。
A sharp rigid animal process or appendage; as a porcupine quill or a ridge on a bone or a ray of a fish fin.
茸毛：与毛发相似的细丝状突出物或刺毛，比如节肢动物的刚毛，或植物表面细胞的生成。
A filamentous projection or bristle similar to a hair, such as a seta of an arthropod or an epidermal process of a plant.
茸毛与毛发相似的细丝状突出物或刺毛，比如节肢动物的刚毛，或植物表面细胞的生成。
A filamentous projection or bristle similar to a hair such as a seta of an arthropod or an epidermal process of a plant.
茸毛与毛发相似的细丝状突出物或刺毛，比如节肢动物的刚毛，或植物表面细胞的生成。
A filamentous projection or bristle similar to a hair such as a seta of an arthropod or an epidermal process of a plant.
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