英语词汇“blue moon”是什么意思，“blue moon”的读音、用法及例句翻译-乐坝网

词汇	blue moon
释义	blue moonn.Informal（名词）【非正式用语】 A relatively long period of time:很长一段时间：I haven't seen you in a blue moon.我好久没有见到你了
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