| 单词 | once in a blue moon |
| 释义 | once in a blue moon once in a blue moon ► F0 not very often: » My sister lives in Alaska, so I only see her once in a blue moon.Thesaurus+: ↑Rarely and infrequently |
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英语词典包含67674条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。