《三国志·魏书·乌丸鲜卑东夷传》
汉建武六年，减省边郡，于是废都尉。
汉光武六年，省边郡，都尉由此罢。
In the sixth year of the Emperor Jianwu of the Han dynasty, border counties were reduced, and the post of duwei was abolished.
<s>[INST] Kindly elucidate the central themes in this passage in English: 汉光武六年，省边郡，都尉由此罢。 [/INST] In the sixth year of the Emperor Jianwu of the Han dynasty, border counties were reduced, and the post of duwei was abolished.</s>
Kindly elucidate the central themes in this passage in English: 汉光武六年，省边郡，都尉由此罢。
user
In the sixth year of the Emperor Jianwu of the Han dynasty, border counties were reduced, and the post of duwei was abolished.
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