回天无力huí tiān wú lì

have no power to save a desperate situation; have no way out
❍ 她的病是肺癌，医生们都感到～。Her case turned out to be lung cancer. The doctors felt that they had no power to save her.

• tripe
• tripe-visaged
• tripitaka
• triple
• triple alliance
• triple alliance，war of the(或paraguayan war)
• triple crown
• triple entente
• triple jump
• triplex
• triplicate
• tripod
• tripoli
• tripolis:
• tripolitania
• tripolitan war
• tripos
• tripping
• trippingly
• triptych
• tripura
• triquetra
• tri-ratna
• tri-service
• trisquare