求翻译：工程项目及做法的变动，必须经双方协商一致，以甲方代表与乙方签定书面变更单为准，确定增减项目及价差后再施工，同时调整相关工程费用及工期。是什么意思？

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Projects and practices, the changes must be as agreed by the parties, in order to Party A and Party B representatives signed a written change for single item and price differences, and identify changes after construction, and at the same time to adjust the relevant project costs and scheduling.

The engineering project and the procedure change, must pass through both sides to consult unanimously, represents by the party of the first part with the second party evaluates written changes Shan Wei, after determined the fluctuation project and the price difference constructs again, simultaneousl

Projects and changes in practices, must be approved by consensus between the two sides, represented by the party a and party b signed a written change order shall prevail, after determining spreads and increase or decrease in project construction and adjustment-related project costs and durations.

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