1 the part of a building, vehicle, etc which covers the top of it (楼房、车辆等的)顶部:
a flat/sloping/tiled roof平╱斜╱瓦屋顶the roof of a car车顶The library and the sports hall are under one roof (= in the same building).图书馆和运动馆在同一座楼房里。☞pictures at car and on page C7 见car及C7页插图
2 the highest part of the inside of sth (某物内部的)最高部份:
The roof of the cave had collapsed.洞顶已经塌下来了。The soup burned the roof of my mouth.这汤灼痛我的上颌。
a roof over your head somewhere to live 栖身之所:
I might not have any money, but at least I've got a roof over my head.我或许没有钱,但至少我还有个栖身之所。