各方行为可能废弃某项合同条款， 如果书面指令存在法定要求， 则该要求适用。

While the actions of the parties may waive a contract clause, the requirement will be upheld when there are statutory requirements for written directives.

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本合同的条款，除非获得合同双方书面同意，不得予以改正、废弃或修改。

No provisions of this Agreement may be modified, waived or amended except with the written consent of both parities.

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