求翻译：如无特别声明或约定，本协议为甲乙双方签订的《采购合同》或其他贸易合同的不可分割部分。如需变更，甲乙双方应另行签订协议，对变更的内容进行明确约定是什么意思？

If there is no special declaration or agreement, the agreement signed by both parties "procurement contract" or other trade an integral part of the contract. If you need to change, both parties entered into separate agreements, expressly agreed to change the contents of

If there is no special declarations or conventions, the agreement signed by both parties to the contract for the purchase or other trade contracts of an integral part of. If changes are required, and both parties should be separately signed an agreement to the change of the content to be expressly

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If there is no special declarations or conventions, this agreement both parties signed the purchase contract or other trade as an integral part of the contract. If changes are required, a and b both sides should enter into any further agreements, to clear the details of any change in the agreed

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