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背景我國北方的長城,開始於戰國秦、趙、燕三國.戰國時期,匈奴也强大起來,不斷擄掠秦、趙、燕三國北部邊境.秦國為了防止匈奴人南掠,昭王下令於隴西、北地、上郡北部邊境修築長城,並派軍駐守秦代蒙恬大規模築長城.漢初…
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