《汉书·传·司马相如传下》
如今陛下喜爱登上险要的地方，射击猛兽，突然遇上特别厉害的野兽，在意料不到的地方使马受惊，冒犯您清道的副车，乘舆来不及旋转车辕，侍卫没机会施展技巧，纵然有乌获、逢蒙那样的技艺，才能得不到发挥，就连枯朽的树木都可以成为祸害了。
今陛下好陵阻险，射猛兽，卒然遇逸材之兽，骇不存之地，犯属车之清尘，舆不及还辕，人不暇施巧，虽有乌获、逢蒙之技不能用，枯木朽株尽为难矣。
Now your majesty likes to climb dangerous places and shoot fierce beasts. If you suddenly encounter a particularly powerful beast, and it frightens the horse at an unexpected place, offends the deputy car that is clearing the way for you, and the carriage does not have time to turn the shaft, and the guards have no chance to use their skills, even if they have the skills of Wuhuo and Fengmeng, their talents will not be able to be displayed, even the withered trees can become a disaster.