blue moon

The story is just a blue moon.

这个故事根本就是件不可能的事.

He gives us a treat only once in a blue moon.

他招待我们一顿可真是千载难逢.

By living a blue moon with the Indians, he was assimilated to them in his thinking and actions.

由于长期和印第安人共同生活, 他在思想和行动上都被他们同化了.

Something that happens once in blue moon almost never happens.

那种罕见的事情几乎不会发生.

We also did all the work for the Blue Moon Race.

我们也为蓝色月亮比赛做了所有的工作.

Where have you been? I haven't seen you in a blue moon.

你到哪儿去了? 我好久没见到你了.

That sort of thing only happens once in a blue moon.

这种事情难得发生一次.

It was an opportunity that comes once in a blue moon.

这种机会来一次可太难了.

He gets drunk only once in a blue moon.

他难得喝醉酒.

This is a chance once in a blue moon.

这可是个难得的机会.