单个的,非组装的,外部不含有复杂配件的,如只,块,支,根,条均用 Piece。成套的设备,如台,部,套,,均用 set,机组:unit,一管牙膏tooth paste tube一把,一捆: a group从有道桌面词典挑选如下例句供楼主参考:We can give 5% discount for the quantity of 7,000 pcs.如有7,000只的数量,我们可给予5%的折扣。The exhibits totaled 3,500 pcs.展品数总计达3,500件。We have delievered 200 pcs and please tell us the time of payment!前期我们已经出了200台的货了,请问你什么时候回款给我们? Our best FOB Shenzhen price is US$8 per piece for minimum 5,000 pcs.我们最好的深圳离岸价是8美元/每只,最低数量5000只.