Hayley教口语，“千载难逢”用英语怎么说？

千载难逢 来自每日学英语 00:00 01:45

once in a blue moon

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。

This is a chance once in a blue moon.

这是个千载难逢的好机会。