fourteenth是序数词,指第14的意思,fourteen是基数词,是指14的意思,例如:
1、The fourteenth century cathedral was reduced to a mass of rubble.这座14世纪的大教堂变成了一堆瓦砾。
2、On "the New Art" of France in Fourteenth Century.略论十四世纪法国的新艺术。
3、When I was fourteen, my family moved to another city.当我十四岁的时候,我的家人搬到了另一个城市