My keys are missing I have looked for them everywhere but still haven’t found them.

【1】missing  adj.找不到的；不在的；丢失的，失踪了的

Five people were missing in this accident.五个人在这场事故中失踪了。

I never found the missing piece.我一直没找到丢了的那件。

My gloves have been missing for ages.我的手套已经丢了很久了。

Two files have gone missing .两个档案不见了。

【2】lose  vt.遗失；丢失，丧失；失去

He lost his keys yesterday他昨天把钥匙弄丢了。

One of her legs was lost in a car crash她在一次车祸中失去了一条腿。