steel key

例句：

1. 1.The old man had a steel key to his house.
   那位老人有一把开他房子的钢制钥匙。
2. 2. The car was locked with a steel key.
   这辆车用钢制钥匙锁上了。
3. 3. The thief used a steel key to unlock the safe.
   那个小偷用一把钢制钥匙打开了保险箱。