英语词汇once-in-a-blue-moon怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

英汉双解词典包含207842条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。

单词	once-in-a-blue-moon
释义	请查阅词条：once in a blue moon idiom1
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