on.lay
n.(名词)Something laid or applied over something else, as to add relief to a surface.装饰用贴面:贴在某物表面上的材料,用来突出该物体表面特征Medicine A graft applied to the surface of the recipient organ or structure.【医学】 覆盖物:医学上附加在器官或组织表面的一层皮膏Dentistry A cast, usually made of gold, attached to the occlusal surface of a tooth.【牙科学】 填补物:牙科学中所用的一种石膏,通常是金子制的,用来填牙齿损坏的部分