once in a lifetime
US /wʌns ɪn ə ˈlaɪfˌtaɪm/
UK /wʌns ɪn ə ˈlaɪfˌtaɪm/
1.
一生一次的, 千载难逢的
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经历。
•
This opportunity to travel the world is truly a once in a lifetime chance.
这个环游世界的机会真是千载难逢。