999英语网 英语单词
Keratin的音标发音
Keratin
英式发音：['kertn] or ['krtn]
美式发音
(noun.) a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves.
休整理
(noun.) a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves.
休整理