steel nail

例句：

1. 1. The carpenter used a steel nail to fasten the wooden planks together.
   木匠用钢钉将木板固定在一起。
2. 2. The construction workers were busy hammering steel nails into the concrete wall.
   建筑工人正在忙着将钢钉打入混凝土墙上。
3. 3. The engineer used steel nails to reinforce the beams in the bridge.
   工程师用钢钉加固了桥梁的梁。