nail iron

例句：

1. 1.The hammer is a tool used to drive nails into wood.
   锤子是一种用来将钉子打入木头的工具。
2. 2. The carpenter uses a nail iron to hold the wooden planks together.
   木匠使用一个铁钉来将木板固定在一起。
3. 3. The nail iron was rusted and needed to be replaced.
   铁钉生锈了，需要更换。