Any and all modifications of this Agreement shall be made in writing and must be executed by all parties as a conditionprecedent 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。
2
It is a conditionprecedent to every right action.
真理是每一次正确举动的先决条件。
3
Where by this clause any dispute or difference is to be referred to arbitration the making of an award shall be a conditionprecedent to any right of action by either party against the other.