iron family metal

例句：

1. 1. The iron gates are strong and secure.
   铁大门坚固而安全。
2. 2. He hammered away at the iron until it was smooth.
   他锤打铁直到它变得光滑。
3. 3. Iron is a very useful material for making tools and weapons.
   铁是一种非常有用的材料，用于制作工具和武器。