常見例句According to this scenario, scales became feathers by first elongating, then growing fringed edges, and finally producing hooked and grooved barbules.根據(jù)傳統(tǒng)理論，鱗片變成羽毛的第一步是先拉長，接著長出流囌般的邊緣，最後産生有小鉤與溝槽的羽小枝。 返回 barbules