| 单词 | blue moon |
| 释义 | blue moon blue moon n: figurative (long period) SC 千载难逢 TC 千載難逢 Why, it's a blue moon since I saw you last. once in a blue moon adv: figurative (very rarely) SC 千载难逢地 SC 极为罕见地 He only calls once in a blue moon. |
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