Its first setup was soon after the fourth year of Yuanshou in Wudi period(B. C. 119), and the places were scattered in the belt from Shuofang to Lingju.
其始置时间为汉武帝元狩四年（前119）后不久，最早设置的地点在朔方至令居一带；
Its first setup was soon after the fourth year of Yuanshou in Wudi period(B. C. 119), and the places were scattered in the belt from Shuofang to Lingju.
其始置时间为汉武帝元狩四年（前119）后不久，最早设置的地点在朔方至令居一带；
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