a blue moon
汉语翻译
不可能的事
例句
- Barry only visits his parents once in a blue moon.巴里很难得去看望他父母一次。
- If the river overflows its banks, the garden gets flooded; but that only happens once in a blue moon.河水一旦泛滥，这片园子就会淹没，但这种情况极为罕见。
- I see her once in a blue moon.我难得看到她。
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