钥匙环的英文：
a key ring

参考例句：

Chains clanked on his motorcycle boots and on the key ring hanging from his wide leather belt
他的宽大皮带上的钥匙环和摩托车皮靴上的链子叮当作响。

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。

This is a key laboratory of atmosphere sounding.
这是个大气探测重点实验室。

Idleness is the key of beggary
懒汉出乞丐

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。

The lost ring was never found.
遗失的戒指再也没有找到。

multiple (double) annual ring
复年轮