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学为贵雅思培训-北京雅思培训机构项目部提供：雅思习语表达常见的"超级蓝月"。
今天学为贵逄博老师为大家讲解152年难见的奇观，月全食，蓝月亮。
once in a blue moon 千载难逢，难得一次
If something happens once in a blue moon is happens only very rarely. I only get over to Cambridge once in a blue moon and I'm never in London. Only once in a blue moon do properties of this quality become available.
Note: In some places, if there are two full moons in a calendar month, the second is called a `blue moon'. This is rare.
下面给大家一些口语里经常用得到的例句：
I seldom go to a movie& maybe once in a blue moon.
我很少去看电影，难得去一回。
It was an opportunity that comes once in a blue moon.
这种机会来一次可太难了。
Stamp collecting is interesting, but you find a valuable stamp only once in a blue moon.
集邮是很有趣的事情，但一张有价值的邮票却是千载难逢的。
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