carrot-and-stick 恩威并施

carrot-and-stick

 adj.
Combining a promised reward with a threatened penalty:
 软硬兼施的把承诺的奖赏与威胁性的惩罚结合在一起的：

took a carrot-and-stick approach to the rehabilitation of juvenile offenders.
对少年犯的改过自新采取恩威并施的方法