incentive

n. /ɪnˈsen.t̬ɪv/ B2

激励；动力；诱因

Something that encourages a person to do something.

仙境例句

The Queen's shout of “Off with his head!” was a strong incentive to sit still.

王后那声“砍掉他的头！”让大家都乖乖坐着一动不动。