如何翻译“本协议一式两份，甲乙双方各执一份，自双方代表认可签字及加盖公章或合同章开始生效。”

This agreement has been made out in two identical copies, one for each contracting party and validates with two parties' signed signiatures and sealed stamps or authorized contract stamps.

The agreement can be taken as an annexe to the material purchase and consignment contract signed by two contracting parties. And this agreement is the only reference agreement if any conflict incurs.

This Contract shall come into effect after signature by the both parties. This Contract is made out in two original copies, one copy to be held by each party.