once in a lifetime
US /wʌns ɪn ə ˈlaɪfˌtaɪm/
UK /wʌns ɪn ə ˈlaɪfˌtaɪm/
1.
一生一次的, 千載難逢的
an event or opportunity that is very rare and unlikely to happen again in a person's life
:
•
Seeing the total solar eclipse was a once in a lifetime experience.
看到日全食是一生一次的經歷。
•
This opportunity to travel the world is truly a once in a lifetime chance.
這個環遊世界的機會真是千載難逢。