One and a half teaspoonfuls.teaspoonful为什么要加S

one and a half one + 名词 + and a half one kilo and a half one and a half ticket one and half还是one and a half one and a half hours 还是hour half的用法是 one and a half years 还是one and a half year?half具体的用法? one month and a half和one and a half month有区别吗?还有one hour and a half和one and half an hour哪个对? The meeting lasted for ( ).A.one and half a hour B.one and half hour C.one and a half hours D.one and the half hour one and one-half billion和one and a half billion那一句常用啊 注意是：one and half 和 one and a half区别注意是：one and half 和 one and a half．他们有什么区别吗? The boy always stays there for___a.one and half hour b.one and a half hour c.one and half hoursd.one and a half hours She has read English for__________.A one and a half mouth Bone and a half mouths C one and half mouths D one mouth and half 是one and a half hours还是one and a half hour one and a half hours 和 one hour and a half的意思一样吗 one and a half hours还是one and a half hour 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