我想问下3小时在英语中的表达是不是three hours 关于这hour什么时候该加S

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• 我想问下3小时在英语中的表达是不是three hours 关于这hour什么时候该加S
• 我想问下3小时在英语中的表达是不是three hours 关于这hour什么时候该加S
• It was a three-hour journey 中的hour为什么不加S,不是复数要加S的吗?
• 1.The journey around the world took the old sailor nine months,_______ the sailing time was 226days.A.of which B.during which C.from which D.for which把后面的 of which the sailing time was 226days.改成一个句子就是 the sailing time of the nine months was 226 days.根据 of the nine months 应该是of the which 为什么答案就是of which呢?不是有the的嘛!不知你是否理解我的意思／愿听解释.