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| 单词 | once in a blue moon |
| 释义 | once in a blue moon in British English informal See full dictionary entry for blue moonvery rarely; almost never once in a blue moon in British Englishvery seldom once in a blue moon in American English very seldom; almost never once in a blue moon in American English very seldom; almost never once in a blue moonvery rarely I only get over to Cambridge once in a blue moon and I'm never in London. Examples of 'once in a blue moon' in a sentence |
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