balancing act
noun /ˈbælənsɪŋ ækt/
  /ˈbælənsɪŋ ækt/
[usually singular]- a process in which somebody tries to please two or more people or groups who want different things平衡各方权益的行动 - The UN must perform a delicate balancing act between the different sides in the conflict.联合国必须在冲突各方之间担任公正的协调工作。 
 
- The UN must perform a delicate balancing act between the different sides in the conflict.