弹子锁

例句：

1. 1. The old man kept his treasures in a wooden box with a brass key.
   老人用一个木盒子和一把铜钥匙保存他的宝贝。
2. 2. She locked the door and went out to buy some groceries.
   她锁上门去买一些杂货。
3. 3. The thief tried to break into the house but failed due to the sturdy lock.
   小偷试图闯入房子，但因为坚固的锁而失败了。