n a protective covering that covers or forms the top of a building
n protective covering on top of a motor vehicle
n the inner top surface of a covered area or hollow space
n an upper limit on what is allowed
v provide a building with a roof; cover a building with a roof
n. 屋顶( roof的名词复数 ); (1)顶板(2)顶（巷道）; 有…顶的; 洞顶