hardadj.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hardbackn.精装本；硬封面的书

1. A durable method of painting on a wall by using watercolors on wet plaster.
   用溶解于水的颜料在有新鲜灰膏的墙上作画的方法。