hard adj.硬的；困难的；棘手的；坚强的；残酷的；用力的；液态的；严寒的；确凿的adv.努力地；强烈地；严重地；坚定地
双语例句
The central white area is very hard and gritty, because the neoplasm is producing a desmoplastic reaction with lots of collagen.This is often called a "scirrhous" appearance. 因为大量胶原纤维的形成，使中央白色区域非常坚硬并有硬粒感，称之为硬癌。
