西汉天汉元年 ,汉武帝刘彻派遣苏武以中郎将职衔持节出使匈奴 ,常惠应募作苏武随员同往。当苏武使团完成外事任务返回之际 ,匈奴国内突发政变事件。副使张胜涉嫌参与谋反 ,苏武一行人全部被扣押 ,长达 1 9年之久。后来 ,汉朝与匈奴“和亲”成功后 ,西汉派使臣前往匈奴 ,提出释 In the first year of the Western Han Dynasty, the Han Wudi Liucher dispatched Su Wu to serve in the post of Minister of Central Government of Langzhong, and Chang Hui was recruited as the accompanist of Su Wu. When the Soviet mission to complete the mission of foreign affairs to return the occasion, the sudden coup in the Huns. Deputy Zhang Sheng suspected of involvement in rebellion, Su Wu all pedestrians were detained for as long as 19 years. Later, the Han Dynasty and the Huns “and” pro-success, Western Han sent envoys to the Huns, put forward