Once in a blue moon 千载难逢;极为罕见(very rarely)
Winning the lottery happens once in a blue moon.彩票中奖是很少见的。
No way! You only get a chance like this once in a blue moon.不会吧! 这种机会可是千载难逢啊。
Once in a blue moon 千载难逢;极为罕见(very rarely)
Winning the lottery happens once in a blue moon.彩票中奖是很少见的。
No way! You only get a chance like this once in a blue moon.不会吧! 这种机会可是千载难逢啊。
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