钥匙扣的英文：
1.key ring
2.key chain
3.key holder

key是什么意思：
n. 钥匙；线索；按键；调；关键
adj. 最重要的；关键的
v. 为…调音；用键盘输入

We have a key for the door of the house and a key for starting the car.
我们有房间门的钥匙和发动汽车的钥匙。

I left the key in the lock.
我把钥匙留在锁上，忘了取下来。

He fished in the bag for the keys.
他在袋子里摸找钥匙。

ring是什么意思：
n. 环形物；戒指；拳击场；铃声，钟声
v. 包围；成环形；按铃；敲钟；回响；打电话

There was a ring at the bell.
铃声响了。

The impulse ring is a composite, magnetized ring.
脉冲环是一个合成磁化圈。

That ring is certainly the cheese.
那只戒指无疑是精品。

chain是什么意思：
n. 链，束缚，连锁
v. 用锁链拴住，束缚，囚禁

a chain of supermarkets/a supermarket chain
超级市场联号.

a chain of mountains/a mountain chain
连绵的山[山脉]

Chains of gold are stronger than chains of iron
金链锁人比铁炼更牢靠