billet steel

例句：

1. 1. The new bullet steel is much stronger than the old one.
   这种新的子弹钢比旧的强得多。
2. 2.The bullet steel was used in the construction of the new bridge.
   这种子弹钢被用于新桥的建设。
3. 3. The bullet steel is a popular material for making guns and ammunition.
   子弹钢是制作枪支和弹药的常用材料。