once a year

US 
UK 
  • na.每年一次
  • Web一年一次;一年一度;每年一届
na.
1.
每年一次
2.
“once a week/month/year etc.”的变体

Sample Sentence

Definition:
Category:AllAll,OralOral,WrittenWritten,TitleTitle,TechnicalTechnical
Source:AllAll,DictionaryDictionary,WebWeb
Difficulty:AllAll,EasyEasy,MiddleMiddle,HardHard