girder

名词 girder:

1. a beam made usually of steel; a main support in a structure

1. The block is still just a skeleton of girders.
   这片建筑还只是仅有主梁的骨架。

gird.er

n.（名词）
A horizontal beam, as of steel or wood, used as a main support for a building or bridge.
大梁：一水平的铁制或木制的桁条，用来作为建筑物或桥梁的主要支撑物