5. The dispute shall be submitted for arbitration by a mutually nominated arbitrator.
爭議應由雙方提名的仲裁者來仲裁。
還能這樣說：
The mutually nominated arbitrator should submit the dispute for arbitration.
The mutually nominated arbitrator should arbitrate the dispute.
應用解析：
nominate sb. as... 任命某人為……
nominate sb. for... 提名某人為……的候選人；
nominate sb. to 任命某人為……的成員

6. We may discuss to agree upon a temporary arbitral body when needed.
我們討論同意需要時成立一個臨時的仲裁委員會。
還能這樣說：
We will make a discussion about a temporary arbitral body when it is needed.
We will discuss to found a temporary arbitral body when needed.
應用解析：
body clock 生物鐘；
body language 身體語言

7. Since this dispute is not negotiable, it is necessary to resort to arbitration.
既然爭議不能協商解決，有必要將其訴諸仲裁。
還能這樣說：
It is necessary to resort to arbitration if this dispute cannot be settled by negotiation.
The dispute which cannot be negotiated will resort to arbitration.
諺語：
Don't wait for a rainy day to fix the roof.
未雨綢繆。

8. We are now applying formally to the arbitration commission for arbitration of this dispute.
我們現在正式向仲裁委員會就此爭議仲裁。
還能這樣說：
We are applying for a formal arbitration to the arbitration commission.
We are about to apply to the arbitration commission to arbitrate the dispute.
應用解析：
acceptance commission 承兌手續費；
agricultural commission 農業委員會；
arbitration commission 仲裁委員會