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.
本文通过考证，可知杨氏与弘农的结合当始于与汉宣帝前后的杨敞、杨恽父子，并深入探讨了杨氏与弘农地望紧密结合的历史背景。
Through the analysis, we can know that the combination of the Yang and Hongnong start from Yang Chang and his son Yang Yun during the period of Emperor Han Xuan.
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