后来的长城由汉，隋和晋朝以极大的代价来修理，改建或是扩建长城以捍卫自己免于北方的侵略。
Later, the Han, Sui and Jin dynasties all repaired, rebuilt, or expanded sections of the great Wall at great cost to defend themselves against northern invaders.
西汉王朝从汉武帝至汉宣帝期间，修筑了约两万里长城，其中绝大部分修建于汉武帝时期。
During the period from Emperor Wu to Emperor Xuan in the Han Dynasty, about 7000 miles of the Great Wall was built, most which was set up during the regime of Emperor Wu.
西汉王朝从汉武帝至汉宣帝期间，修筑了约两万里长城，其中绝大部分修建于汉武帝时期。
During the period from Emperor Wu to Emperor Xuan in the Han Dynasty, about 7000 miles of the Great Wall was built, most which was set up during the regime of Emperor Wu.
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