surface treated steel

例句：

1. 1. The new bridge is made from surface-treated steel, which is much stronger than ordinary steel.
   这座新桥是用表面处理过的钢材建造的，比普通钢材要坚固得多。
2. 2.The construction company used surface-treated steel for the beams to increase their durability.
   建筑公司使用表面处理过的钢材来制作梁柱，以增加其耐用性。
3. 3. The engineer recommended using surface-treated steel for the bolts to prevent corrosion.
   工程师建议使用表面处理过的钢材来代替螺栓，以防止腐蚀。