once-in-a-lifetime

剑桥词典

A once-in-a-lifetime experience or opportunity is very special because you will probably only have it once .
一生中難得一次的；千載難逢的；難能可貴的
A tour of Australia is a once-in-a-lifetime experience . 澳大利亞之行是一生難得的一次經歷。 返回 once-in-a-lifetime