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
双语例句
The timber carries the whole weight of the roof. 栋梁支撑屋顶全重。
Turning my fluttering heart into a tree, let it stand firmly to welcome the baptism of time, being the paragon of mankind and the pillar of the nation. 化心旌为树，迎接时代的洗礼，坚毅地站着，为人类之灵长，为民族之栋梁。
