an hour and a half
one and a half hour
请及时采纳,多谢!那么 如果是twohour要不要s?要 two hours两种都要？更正：one and a half hours一个半小时也要加s那 two hours and a half 对还是错？two and a half hours对还是错？two hours and a half 对two and a half hours对两种都对。不过都不是一个半小时的意思，而是两个半小时。