manned military position驻防军事阵地
Mayi defense system was an important link in the north in Qin and Han Dynasty. It was the outpost of the war to Xiongnu and had an important military position.
秦汉时期的马邑是北边防御体系中的重要一环，是秦汉对匈奴战争的前哨，具有重要的军事地位。
参考来源 - 秦汉马邑历史地理若干问题研究Mayi defense system was an important link in the north in Qin and Han Dynasty. It was the outpost of the war to Xiongnu and had an important military position.
秦汉时期的马邑是北边防御体系中的重要一环，是秦汉对匈奴战争的前哨，具有重要的军事地位。
参考来源 - 秦汉马邑历史地理若干问题研究