unpainted steel

例句：

1. 1. The construction site was littered with unpainted steel rebar.
   施工现场到处都是未涂装的钢筋。
2. 2. The new bridge is made of unpainted steel, which is stronger and more durable.
   这座新桥是用未涂装的钢建造的，它更坚固耐用。
3. 3. The engineer inspected the unpainted steel beams for any signs of wear or damage.
   工程师检查了未涂装的钢梁，看是否有磨损或损坏的迹象。