blue moon

Great writers like Mark Twain only appear once in a blue moon.

(像马克吐温那样伟大的作家,是很罕见的. )

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

这种机会来一次可太难了.

Eg . Seeing the partial eclipse is once in a blue moon.

看见月偏食真是个千载难逢的事.

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.

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

这种事情难得发生一次.

In the city met you is real once a blue moon!

在这个城市里能遇到你真是太难得了!

Something that happens once in blue moon almost never happens.

那种罕见的事情几乎不会发生.

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.

The story is just a blue moon.

这个故事根本就是件不可能的事.

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.

Such a chance comes once in a blue moon.

这样的机会极其难得.

This is a chance once in a blue moon.

这可是个难得的机会.

You get a chance like this only once in a blue moon.

这种机会你是很难得到的.

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.

He gets drunk only once in a blue moon.

他难得喝醉酒.