he was travelling on the eight o'clock train to London.为什么用on详细说明下
问题描述：
he was travelling on the eight o'clock train to London.为什么用on详细说明下
答
travel on ...乘坐（用）...旅行
可指抽象 也可指具体 例：
travel on foot
徒步旅行
travel on that plane
乘坐那趟飞机旅行
he was travelling on that train to London
他乘坐那趟火车到伦敦
he was travelling on the （eight o'clock） train to London
他乘坐八点那趟火车到伦敦
括号中的 eight o'clock 修饰 train 连起代表八点的那趟火车