的意思 a blue moon

1. It only happens once in a blue moon, so we should cherish it when it does.
Translation: 它只发生一次在蓝月亮，所以我们应该珍惜它。

2. I haven't seen him in a blue moon, I wonder how he's been.
Translation: 我很久没有见到他了，在蓝月亮，我想知道他过得怎么样。

3. This kind of opportunity comes once in a blue moon, so we should seize it.
Translation: 这种机会很少见，我们应该抓住它。

4. I saw a shooting star last night, which is as rare as a blue moon.
Translation: 昨晚我看到了一颗流星，这和蓝月亮一样罕见。

5. She only visits us once in a blue moon, but it's always a joy to see her.
Translation: 她很少来看我们，但每次见到她都是一种快乐。

6. The last time I wore this dress was once in a blue moon, but it still looks good on me.
Translation: 我上一次穿这件裙子是在蓝月亮，但它仍然很适合我。