请输入您要查询的英文单词：
单词
once in a blue moon
释义
once in a blue moon
:
very rarely
难得有一次；极为罕见
It happens
once in a blue moon
.
这真是千载难逢啊。
blue moon
随便看
on top of the world
onto something
onto the defensive
on tour
on tow
on track
on trial
on TV
on/under false pretenses
on/under pain of
on/under the pretext that
on/under/with the assumption
on unemployment
on/upon impact
On/Upon reflection
onus
on vacation
on video
on videocassette
on videotape
on view
on vinyl
on waivers
onward
onward and upward
英汉双解词典包含109353条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。
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更新时间：2025/8/25 7:05:44