请问“两个半小时”是“two and a half hour”还是“tow and a half hours”?

请问“两个半小时”是“two and a half hour”还是“tow and a half hours”? 两个半小时是two and a half hours?two hours and a half?hour后有s吗 one hour and a half 是一个半小时 两半小时是不是 two hours and a half? 一个半小时 英语：是one and a half hour 还是 one and a half hours 一个半小时英文怎么说到底是one and a half hour还是one and a half hours 哪个正确, one and a half hours 还是hour 2个半小时用英语说应该是two and half an hours,还是two and a half hours? two hours and half a hour 2个半小时 这种表达对吗 是one and a half hours还是one and a half hour 是one and a half hour 还是 one and a half hours two hours and a half 是one and half hours还是one and half hour?