what 3 events happen in the same year but only happen once ever 4 years"

问题描述:

what 3 events happen in the same year but only happen once ever 4 years"

Olympics, World cup。。。。。。。。and??

什么项目一年3次,4年一届?
脑筋急转弯?
2月29的3顿饭吧
the meals of 29th February