poisoned chalice
noun
- an assignment, award, or honour which is likely to prove a disadvantage or source of problems to the recipient有毒的圣杯（指对获得者可能不利或引起问题的工作、奖励或荣誉）：
many thought the new minister had been handed a poisoned chalice.
很多人都认为这位新部长所接任的是一个有毒的圣杯。