短语词组短語leaf epidermis piliferous cell 葉鱗毛embryo skin epidermis stem cell 胚胎皮膚表皮乾細胞epidermis cell layer 表皮細胞層onion epidermis cell 洋蔥表皮epidermis cell wall 表皮細胞壁human epidermis cell culture 表皮細胞培養 返回 epidermis cell