No changing or modification of this Agreement shall be valid unless the same is made in writing.

本协议之修改必须作成书面始生效力。

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No change in or modification of this Agreement shall be valid unless the same is made in writing.

本协议之修改必须作成书面始生效力。

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Any and all modifications of this Agreement shall be made in writing and must be executed by all parties as a condition precedent to implementation of such a modification.

对本协定的任何修改均要采取书面形式作为先决条件，修改后的条款各方都必须要遵守和实行。

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