once in a blue moon
英
美
- 罕见的,极少的,难得的; 千载难逢地
once in a blue moon的用法和样例:
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。
词汇搭配
- once in a blue moon 罕见的,极少的,难得...