an hour one hour

an hour one hour a one -hour还是an one-hour 冠词 an one-hour 还是a one-hour 是a one-hour ducumentary还是an one-hour documentary half an hour 与 one half hour区别 more than one hour和more than an hour区别 one hour和an hour,两个是无差别的吗? on-hour one-hour ride a hour 还是 an hour? a hour 还是 an hour One and a half an hour 和An hour and a half 有什么不同 have one hour to have lunch have (时间长短 例如an hour)to do sth 可