once in a blue moon
英
美
- 罕见的，极少的，难得的；千载难逢地
双语例句
- It was in the days when motorcars were rare.
那是在汽车还罕见的时代。 - Several rare birds have been sighted in this area.
本地区已发现了几种罕见的鸟。
用法讲解
- once in a blue moon 罕见的，极少的，难得...
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