corps是来自法语的词,单复数同形不同音。基本意思是“兵团,军团”,是军事单位,由两个或两个以上师的兵力组成,也可指特种部队；还可指“共同工作、活动的一群人”,是集合名词,首字母常大写。

He was a soldier of marine corps.他曾是海军陆战队里的一名士兵。
I just joined the Army Service Corps.我参加了辎重部队。
A corps of doctors arrived to inoculate the recruits.一队医生来给新兵打防疫针。
The corps are assembling near this town.军团正在本城镇附近集结。