you get a chance like this only once in a blue moon。

这种机会真是千载难逢。

he only comes here once in a blue moon.

他只是偶尔到这儿来一次。

she seldom went out of her room after the tragic accident. only once in a blue moon did we see her shopping in the nearby supermarket.

自从那次悲惨的事故以后她很少走出她的房间。我们只是极难得地看见她在附近的超级市场买点儿东西。

if you only send faxes once in a blue moon, do it from staples or a copy shop.

如果您只发送传真一次在一蓝色的月亮，也从史泰博或复印店了。 美。

to keep the game interesting, most of it is paid out in dribs and drabs: a machine that returned $95,000 of every $100,000 in one huge jackpot once in a blue moon would be too disheartening to play.

为了让赌戏保持吸引力，机器回馈的奖金都是零零碎碎的：如果在一回千载难逢的机遇下一次性返还奖池内10万美元的95%则太过令人沮丧，玩兴全无。

this draught occurs once in a blue moon.

这场旱灾是一百年也碰不到的。

this is a chance once in a blue moon.

这是个千载难逢的好机会。

you should be grateful for the extra job offer. things like that come along only once in a blue moon.

你应该对额外的工作机会抱有感激之心：这样的事可是极其难得。

if the river overflows its banks, the garden get flooded, but that only happens once in a blue moon.

河水一旦泛滥，这片花园将被淹没，但这种情况极为罕见。

i have almost forgotten what jack looks like. i see him once in a blue moon now.

我几乎已经忘了杰克的模样了。现在我只是极难得地见过他一次。

he’s the kind of player that comes along once in a blue moon, a play maker whose vision, passing and inventiveness makes a huge impact on any game he plays in.

他是那种百年不遇的天才球员。作为球队的核心，他的视野，激情以及创造性都会对比赛产生巨大的影响。

i seldom go to a movie—maybe once in a blue moon.

我很少去看电影，难得去一回。

from this perspective, unused functions should not be dropped from software merely because they are used once in a blue moon.

从这个观点来说，不习惯使用的功能不应该仅仅从软件中去除因为他们往往给使用他们的用户一种千载难逢的感觉。

she visits us once in a blue moon.

她难得来看我们一次。

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。

sally:wow, this is really a chance once in a blue moon. please invite me to go with you!

哇，这真是千载难逢的好机会。求求你邀请我跟你一起去嘛！

sichuan earthquake is once in a blue moon.

四川地震是百年一遇。

worst of all, using poor technique will probably make your program bomb out once in a blue moon or at 3 am on an important client's system.

最糟糕的是，使用差劲的技术，您的程序在重要客户的系统上有可能不是很长时间才崩溃一次，就是早上三点钟就崩溃。

once in a blue moon is an informal phrase.

（千载难逢）是一个非正式短语。

we seldom met each other anymore, maybe once in a blue moon on a family gathering.

我们很久才见一次面，在大家庭的聚会上。

it is once in a blue moon to see her do housework.

看见她做家务真是极为罕见啊。

it is amazing! once in a blue moon i got the first prize in the game.

太让我意外了，我竟然在比赛中得了第一。太难得了。

once in a blue moon, you will find a valuable book in the secondhand book stores.

你几乎很少在旧书店找到有价值的书。

how often do you drink beer? b: eh… once in a blue moon!

你多久喝一次啤酒？b：呃……我难得喝一次！