cross-beam
柯林斯词典
1. N-COUNT A crossbeam is a long, thick bar of wood, metal, or concrete that is placed between two walls or other structures, especially in order to support the roof of a building. (房顶的)横梁
He hung the light from a steel crossbeam in the roof. 他在屋顶上的钢横梁上吊上电灯。
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