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。”

问题描述：

请顺便帮忙把下面的一并翻译一下给我，谢谢！

[本协议可视为双方签订的所有材料采购合同及寄售合同的附加协议，如有与本协议冲突，以本协议为准。]

问题解答：

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.