If you exhort someone to do something, you try hard to persuade or encourage them to do it.
例句
Kennedy exhorted his listeners to turn away from violence...肯尼迪劝诫听众远离暴力。He exhorted his companions, 'Try to accomplish your aim with diligence'.他劝诫同伴说:“要通过勤奋努力实现自己的目标。”