built-up member

例句：

1. 1.The engineer designed the building with a built-up member system.
   工程师设计了一座使用组合构件系统的建筑。
2. 2. Thenew bridge is made ofa built-up member thatcan withstand heavy loads.
   这座新桥由一种能够承受重载的组合构件制成。
3. 3. The roof of the house ismade up of several built-up members.
   这所房子的屋顶是由几个组合构件组成的。