To do something “once in a blue moon” is to do it very rarely: “That company puts on a good performance only once in a blue moon.” The phrase refers to the appearance of a second full moon within a calendar month, which actually happens about every thirty-two months. ‒ FreyaAp...
[英 [wʌns in ə hwail] 美 [wʌns ɪn e hwaɪl] ] once in a while的意思、解释 once in a while 基本解释 时不时,偶尔,间或 once in a while 相关例句 ph. 1. He went to see them once in a while. 他有时去探望他们。
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