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

单词	once in a blue moon
释义	once in a blue moon informal very rarely. 〈非正式〉难得有一次, 极为罕见。 ORIGIN: because 'a blue moon' is a phenomenon that never occurs. See main entry:blue
随便看	earwig earwigged, earwigging earwitness earworm ease easeful easel easement ease off/up easer ease someone into ease someone out ease someone's mind ease something away/down/off easily easiness east East Africa East Anglia East Asia East Asian East Bengal eastbound Eastbourne East Cape

英汉双解词典包含131075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。