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1·This agreement is done in duplicate.

本协议书一式两份。《新英汉大辞典》

2·They is both in duplicate.

这两者都是一式两份。

3·This may result in duplicate values.

这可能会导致重复的值。

4·Please sign the receipt in duplicate.

请一式两份签收这个单据。

5·This form should be filled out in duplicate.

这种表格要填写一式两份。

6·The trip records had been kept in duplicate.

旅游记录已一式两份进行了保存。

7·Enclosed is our program invoice in duplicate.

随函附上我方估价单一式两份。

8·Please fill in the exchange memo in duplicate.

请填写外汇兑换单，一式两份。

9·We enclose our sales contract No. 5 in duplicate.

附上我们第5号销售合同一式两份。

10·We enclose our sales contract No. 45 in duplicate.

附上我们第45号销售合同一式两份。