once in a blue moon
英 /wʌns ɪn ə bluː muːn/
中文释义
偶尔 / 难得一次
Something that happens very rarely or infrequently.
常用搭配
- once in a blue moon难得一次
- only once in a blue moon偶尔才有一次
- happens once in a blue moon百年难遇
例句
- We only eat out once in a blue moon.我们难得才出去吃一次。
- A bug this rare shows up once in a blue moon.这么罕见的漏洞难得才出现一次。