plugged steel

例句：

1. 1. The engineer was working on a project that required plugged steel to reinforce the bridge.
   工程师正在处理一个需要用堵塞的钢加固桥梁的项目。
2. 2. The construction crew used plugged steel to build the new highway.
   施工队伍使用堵塞的钢来建造新的高速公路。
3. 3. The old bridge was replaced with plugged steel, which improved its durability and strength.
   旧桥被堵塞的钢所替代，这提高了它的耐用性和强度。