内郡
内郡-
究其缘由：一是在征兵制下，内郡人民到边境“屯戍一岁”，不能适应战争需要；
There were a few reasons as follows : ( 1 ) People in the interior counties must garrison the frontiers for a year according to the conscription system , and could not meet the needs of war ;
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能在一晚内往返德文郡号的地方。
Where he could sail to the Devonshire and back in one night .
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东汉在大部分时间内推行的是郡（国）县二级制。
For most of the time , the Eastern Han Dynasty practised thd system of prefectures and counties .