light-alloy girder

例句：

1. 1. The new bridge is made of light-alloy girder, which makes it more durable and flexible.
   这座新桥是由轻合金梁制成的，这使得它更加耐用和灵活。
2. 2.The engineer used the light-alloy girder to design a bridge that could withstand heavy loads.
   工程师使用轻合金梁设计了一座能够承受重载的桥梁。
3. 3. The light-alloy girder was installed in the middle of the bridge, providing excellent support for the structure.
   轻合金梁被安装在桥梁中间，为结构提供了出色的支撑。