| 词组 | once in a blue moon |
| 释义 | ☞ The colour blue was an arbitrary choice in this phrase. To say that the moon is blue is recorded in the 16th century as a way of indicating that something could not be true. |
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英语词组固定搭配大全包含15956条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。