例句與造句

1. Keratin 17 is expressed in several epithelial structures, most notably in sebaceous glands, the outer root sheath of hair follicles, and the nail bed; its expression correlates well to the clinical phenotypic expression of both steatocystoma multiplex and pachyonychia congenita type 2.
2. It's difficult to find root sheath of hair in a sentence. 用root sheath of hair造句挺難的