once in a lifetime
成語所屬單字lifetime
once in a lifetime — 慣用語
1. so rare and special that it is not expected to happen again to the same person
1.慣用語
釋義
一生一次；千載難逢
so rare and special that it is not expected to happen again to the same person
例句
Seeing the northern lights in person was a once-in-a-lifetime experience for Amihan.
Eitan knew that such a job offer came once in a lifetime, so he accepted immediately.