名词栋梁，屋顶
1. 屋顶：rooftop 屋顶 | rooftree 屋顶 | rook 骗子
2. 栋梁;屋脊：roofsupport 罐顶支柱 | rooftree 栋梁;屋脊 | rooftube 炉顶加热管
3. 屋脊梁; 家 (名)：rooftop 屋顶 (名) | rooftree 屋脊梁; 家 (名) | rook 白嘴鸦; 骗子#车 (名)
rooftree的解释
noun
1. a beam laid along the edge where two sloping sides of a roof meet at the top provides an attachment for the upper ends of rafters
Synonym: ridge ridgepole