[经] 一式二份;一式两份;

Enclosed is our contract No. 345 in duplicate, of which please return us one copy, duly countersign.
随函附上我方第345号合同一式两分, 请会签并回寄一份.
来源:《简明英汉词典》Please complete in duplicate and in BLOCK letters. Delete as appropriate.
请用正楷填写及呈效正副本各一. 删去不适用者.
来源:互联网摘选Signed Commercial Invoice in duplicate showing a deduction of USD 200.00 being commission.
签字商业发票一式二份,显示扣除200美元作为佣金.
来源:互联网摘选The enclosed proforma invoice NO . 1002 in duplicate cover 50,000 yards Poplin.
信内附上五万码府绸第1002号形式发票一式两份.
来源:互联网摘选
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