crossbeam

名词 crossbeam:

1. a horizontal beam that extends across something
   同义词：trave, traverse, crosspiece

cross.beam

n.（名词）
A horizontal or transverse beam, especially a structural member resting on two supports.
横梁，顶梁：水平的或横向的梁，尤指架在两个支柱上的建筑构件