最佳答案：七点半：at seven thirty在 exist; be living七 seven点 drop半 half现在七点半 it is half past seven在七点
七点半：at seven thirty
在 exist; be living
七 seven
点 drop
半 half
现在七点半 it is half past seven
在七点 at seven o’clock = at seven
早七点半发车 the train will depart at 7
他于七点半签到上班 he signed on at half past seven
展览馆十七点半关门 refuse discussion or consideration
