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once in a lifetime
01
used for referring to a very special opportunity that most likely will not be offered more than once to someone
Example
They experience moments that happen only once in a lifetime.
He feels that this chance only comes once in a lifetime.
once-in-a-lifetime
01
千载难逢的, 一生只有一次的
extremely rare or unique and is not likely to be repeated or experienced again in one's lifetime
Example
Being able to attend the Olympics in person is a once-in-a-lifetime opportunity for most people.
能亲自参加奥运会对于大多数人来说是千载难逢的,一生只有一次的机会。
Being part of the Commonwealth Games has been a once in a lifetime experience.
作为英联邦运动会的一部分,是一次千载难逢的体验。