How often is there a sunset or sunrise?

How often is there a sunset or sunrise?的回答? How often is there a sunset or sunrise? 用英文解答：How often is there a sunrise or sunset? how often is therea sunset or sunrise是什么意思 how often is therea sunset or sunrise?怎么回答? there is a sunrise or sunset every45 minutes There is a sunrise or sunset every45 minutes 是什么意思 There is a sunrise or a sunset every 45 minutes.用 every 45 m There is a sunrise or sunset every 45 minutes(用every 45 minu change sunrise for sunset Sunrise Sunset 歌词 sunrise是什么意思,sunset是什么意思