一式

They churn out 3 000 identical toy trains every day.

他们每天生产3 000 辆一式一样的玩。

The document was drawn up in triplicate.

该文件写成一式三份。

We send you herewith two copies of the contract.

我们随附合同一式两份。

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

随附我方第345号合同一式两分，请会签并回寄一份。