... a blue moon：千载难逢的机会 blue book：蓝皮书 blue-sky market：露天市场 ...
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... a blue flower 不可能有的东西 a blue moon 不可能的事 a cooked shirt 浆过的衬衫 ...
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once in a blue moon 千载难逢 ; 难得一次 ; 绝无仅有
in a blue moon 千载难逢
one in a blue moon 千载难逢
got a blue moon 蓝月亮啊
impossible
youdao
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。
Occasionally it will be hundreds of millions and once in a blue moon billions.
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And then, every once in a blue moon, something comes along that is in a category all its own.
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Once in a blue moon, he tells me, he saw an iPhone.
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