短语
中文翻译：一次
同义词：
['once in alifetime', 'once in a while']
例句：
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1. She had never been toNew York before, but she was excitedto go once in a blue moon.
她以前从未去过纽约，但很高兴能偶尔去一次。
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2. He said he would come tovisit her once in a blue moon.
他说他会偶尔来看望她的。
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3. Once ina blue moon, weget to see the full moon.
偶尔我们能看到满月。