triplicate
n
(idm 习语) in triplicate consisting of three identical copies, of which one is the original 一式三份(其中一份为正本)
submit an application in triplicate 提交一式三份的申请书.
triplicate v [Tn]
copy (sth) so that there are three copies including the original 把(某物)制成一式三份(包括正本).