Someone must arbitrate between them.

得有一个人在他们当中进行仲裁。

《新英汉大辞典》

Someone must arbitrate between opposing parties.

得有人为对立的两方进行仲裁。

youdao

He was asked to arbitrate between management and the unions.

仲裁人对工人和管理层之间的纠纷进行了仲裁。

youdao

The units initiate their own policies, rather than trying to arbitrate between specialist departments.

ECONOMIST: The cafeti��re theory of government

Lincoln and Seward, who tried to arbitrate between the two extremes, were determined to get the amendment through the House.

NEWYORKER: Union Man

Though many people vehemently disagree with particular decisions of the court, its legal power to strike down state or federal laws, to arbitrate disputes between the president and Congress, and between either of them and the states, remains unchallenged.

ECONOMIST: The politics of justice