five hours' sleep,hour不是死的东西吗?不是应该用of吗?还有hours'与hour's有什么区别?

five hours' sleep,hour不是死的东西吗?不是应该用of吗?还有hours'与hour's有什么区别? two hours' 为什么不是hour's? hour's和 hours'2个单词的读法有区别吗. rush hour与rush hours的区别 two-hour drive two hours' drive有区别吗 another two hours的hour要加s吗 five hours' time与in five hours有什么区别? 英语里面 three-hours‘和three-hour’s 这样的用法有吗,分别是用在哪里的 两个半小时是two and a half hours?two hours and a half?hour后有s吗 eight hours' sleep 同义词 是不是eight-hour sleep 请问 24 hour 和 24 hours 区别? A two hour B two hour‘s C two hours's D two hours