回天乏术 meaning in Chinese

have no plan to make improvements; powerless to save the desperate situation; unable to save the situation

Only then will the fed really start to feel impotent
也许到那时，联邦储备委员会才会真正感到回天乏术。
Illness became a metaphor for her as an artist and incapacity led to her insignia : use of the lightest of materials , feathers most of all ; an obsession with the fragility of the body , with what can be appended to it and how it can be modified into an artwork ; and a penchant , in her early years , for performance
此后，疾病即成为其艺术作品中的隐喻并且始终带有一种标志性的回天乏术的无力感：采用最轻质的材料，通常是羽毛；不断表现出肉体是脆弱的执念，并且执着于在身体上附加物品，透过建造身体来完成艺术品；在早期艺术生涯中，倾向于加入行为表演的嗜好。