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。
It's only once in a blue moon that you get an opportunity like that.
这样的机会对你来说真是千载难逢。
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。
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。
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。