once in a purple moon
副词 adv.
英文释义
副词 adv.
-
Synonym of once in a blue moon (“rarely”).
— However, in spite all of our complainings, there was a distinct pleasure in shopping along this street, because once in a purple moon, one did strike a really nice model and so very reasonable, that one wondered how the manufacturer could afford to bring it out at the price.
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数据来源: Wiktionary