1、It is amazing! Once in a blue moon I got the first prize in the game.
太讓我意外了，我竟然在比賽中得了第一。太難得了。

2、We have a rare opportunity that comes along once in a blue moon to any group of Americans.
這是一個(gè)千載難逢的機(jī)遇，對(duì)于任何一個(gè)美國(guó)人群體來(lái)說(shuō)都是如此。

3、In the city met you is real once a blue moon !
在這個(gè)城市里能遇到你真是太難得了！

4、Once in a blue moon is an informal phrase.
（千載難逢）是一個(gè)非正式短語(yǔ)。

5、It is once in a blue moon to see her do housework.
看見(jiàn)她做家務(wù)真是極為罕見(jiàn)啊。

6、It's only once in a blue moon that you get an opportunity like that.
這樣的機(jī)會(huì)對(duì)你來(lái)說(shuō)真是千載難逢。

7、I have almost forgotten what Jack looks like. I see him once in a blue moon now.
我幾乎已經(jīng)忘了杰克的模樣了?，F(xiàn)在我只是極難得地見(jiàn)過(guò)他一次。

8、We seldom met each other anymore, maybe once in a blue moon on a family gathering.
我們很久才見(jiàn)一次面，在大家庭的聚會(huì)上。

a blue moon翻譯