尖铁

例句：

1. 1. The sharp pointof the knife is perfect for cutting throughtough materials.
   这把刀的锋利尖端非常适合切割坚硬的材料。
2. 2. The engineer used apointed iron to drill holes in the wall.
   工程师用尖头铁钻在墙上钻孔。
3. 3. The pointed iron was used to markthe boundaries of the new construction site.
   尖头铁被用来标记新建筑工地的边界。