5th 第五 Today is the fifth (of May). 今天是(五月)五号。 the fifth century BC 公元前五世纪 It's her fifth birthday. 这是她五岁生日。 My office is on the fifth floor. 我的办公室在六楼。 It's the fifth time that I've been to America. 这是我第五次去美国了。 Her mother had just given birth to another child, her fifth. 她的母亲刚又生了孩子,她的第五个孩子。 the world’s fifth-largest oil exporter 世界第五大石油输出国 He finished fifth in the race. 他赛跑得了第五名。 Edward V (= Edward the Fifth) 爱德华五世