一式

They churn out 3 000 identical toy trains every day.

他们每天生产3 000 辆样的玩具火车。

The document was drawn up in triplicate.

该文件写成三份。

We send you herewith two copies of the contract.

我们随附上合两份。

Enclosed is our contract No. 345 in duplicate, of which please return us one copy, duly countersign.

随附上我345合两分，请会签并回寄份。