0 not very often:
1 rarely:
It only happens every once in a blue moon.
I read books once in a blue moon.
They stand there for weeks and months, and possibly only once in a blue moon does anyone come to remove them.
Those who do one once in a blue moon inevitably do not produce quite the same results.
There might be, once in a blue moon, but nine times out of ten a boundary change harms either one party or another.
But no one plays billiards except for once in a blue moon; it is too eccentric to decide to have a game of billiards.
This is not something which happens once in a blue moon.
Soon it will be once every 10 years and then once in a blue moon.
中文繁体
少有地…
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少有地…
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de higos a brevas…
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ayda yılda bir, kırk yılda bir, (argo) ölme eşeğim ölme…
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tous les trente-six du mois…
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jednou za uherský rok…
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sjældent…
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jarang sekali…
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