how often is therea sunset or sunrise是什么意思

how often is therea sunset or sunrise是什么意思 how often is therea sunset or sunrise?怎么回答? 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? There is a sunrise or sunset every45 minutes 是什么意思 sunrise是什么意思,sunset是什么意思 sunrise和sunset是什么意思? there is a sunrise or sunset every45 minutes 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 谁能告诉我sunrise和sunset是什么意思?