角质素 jiǎozhìsù keratin Definitions Defs Origin Strokes Stroke Words Sentences Sents 角质素 角質素 jiǎozhìsù keratin the protein that forms the main structure of hair, nails, and the outer layer of skin
角质素 角質素 jiǎozhìsù keratin the protein that forms the main structure of hair, nails, and the outer layer of skin
