decade and a half到底表示多少年?

decade and a half到底表示多少年? 请问“seven and a half thousand”到底是多少?晕了. one and a half a quarter and a half a billion and a half one and a half apples 作主语时谓语动词到底是单数还是复数 英语中one and a half hours中的hour到底用不用加s? 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,还是都对?到底要不要加S? THREE AND A HALF怎么样 one + 名词 + and a half three-and-a-half billion one kilo and a half one and a half ticket one and half还是one and a half an hour and half还是an hour and a half half of them and a halfI'll get half of them and a half翻译 half of them and a half是多少 3/4? half的用法是 one and a half years 还是one and a half year?half具体的用法?