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环绕羽芽有一圈细胞不断增生,在基部形成圆柱状凹陷,称为毛囊。
Proliferation of cells in a ring around the feather germ creates a cylindrical depression, the follicle, at its base.
youdao
-
环绕羽芽有一圈细胞不断增生,在基部形成圆柱状凹陷,称为毛囊。
Proliferation of cells in a ring around the feather germ creates a cylindrical depression, the follicle, at its base.
youdao