百年不遇的英文

【1】occuring only once in a thousand years

【2】once in a blue

拓展资料：例句

If something happens once in a blue moon is happens only very rarely。

once in a blue moon意思是非常罕见的事。

An actual blue moon-that is， the appearance of a second full moon in the same calendar month-occurs every 32 months or so。

真正的蓝月亮——是指，一个月内的第二次满月——大约每32个月出现一次。

He’s the kind of player that comes along once in a blue moon。

他是那种百年不遇的天才球员。