once in a blue moon

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

这种机会你是很难得到的.

Such a chance comes once in a blue moon.

这样的机会极其难得.

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.

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. )

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

这种事情难得发生一次.

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.

This is a chance once in a blue moon.

这可是个难得的机会.

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.

Once in a blue moon you get some problems.

极少会碰到麻烦。

I go to a restaurant once in a blue moon.

我难得在外吃饭,也极少在饭店用膳.

Barry only visits his parents once in a blue moon.

巴里很难得去看望他父母一次.

It'snows here once in a blue moon.

这里几乎不下雪.

He only comes here once in a blue moon.

他只是偶尔到这儿来一次.

This draught occurs once in a blue moon.

这场旱灾是百年不遇的.