| 短语 | once in a blue moon |
| 释义 | once in a blue moon informalvery rarely难得地，破天荒地:•It only happens like this once in a blue moon.这样的情况是极为罕见的。 once in a blue moon informal very rarely. 〈非正式〉难得有一次, 极为罕见。 [ORIGIN: because 'a blue moon' is a phenomenon that never occurs.] once in a blue ˈmoon(informal)very rarely极少地；难得地；破天荒地once in a blue moon非常少地;千载难逢地：A total solar eclipse happens only once in a blue moon，it will be very lucky for a man to see such eclipses twice in his life.发生日全蚀的情况很少，如果一个人一生能看到两次日全蚀，那是非常幸运的事。 |
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