1.(序数) fifth2.(姓氏) a surname 短语和例子第五伦 diwu lun; 第五产业 quinary economic sector; 第五性病 fifth venereal disease法国 第五,第五天: quentin第五版: bpm5; sr5第五边: approach leg; final leg第五病: erythema infectiosum; erythema infetiosum; fifth disease第五步: blog configuration下载手机词典可随时随地查词查翻译