《史记·十二本纪·孝文本纪》
与匈奴和亲，匈奴违背盟约，入边寇掠，然而皇帝只是命令边塞加强守备，不出兵深入匈奴腹地，害怕烦扰百姓。
与匈奴和亲，匈奴背约入盗，然令边备守，不发兵深入，恶烦苦百姓。
After forming a marriage alliance with the Xiongnu, the Xiongnu broke the agreement and invaded the borders to plunder. However, the emperor only ordered the border defenses to be strengthened and did not send troops deep into Xiongnu territory, because he was afraid of troubling the people.