1式2份、1式3份怎么翻译啊

in duplicate form
in triplicate form
in fourfold form
in quintuple form
......

合同样本是这么翻译的
This agreement is in duplicate. Part A and Part B each have one copy.
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例:
停薪留职协议

*****有限公司（以下简称甲方）与本公司职员***（以下简称乙方）就乙方自费赴英国留学一事达成以下协议：

甲方责任义务：
1. 停薪留职期限为****，自****年至****年；
2. 在乙方留学期间，甲方为乙方保留职位，停发乙方月薪，按期为乙方缴纳养老保险金；
3. 乙方毕业回国，甲方为其恢复原有职位。

乙方责任义务：
1. 在留学期间，费用自理；
2. 乙方毕业后应按本协议回甲方工作。如违反协议，甲方将不再为乙方保留职位及待遇。

本协议一式两份，甲、乙双方各执一份。

协议方：
甲方： 乙方：
*****有限公司****
****年**月**日

Agreement
(Translation)

***Co., Ltd. (Part A) reached an agreement with the employee ***(Part B) on****'s study in the UK by his self-support.

The duty of Part A:
1. The deadline of part B’s leaving his post is *** year and *** months, from *** to ***;
2. Party A will keep part B’s post and pay old-age pension for part B;
3. Party A will resume