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内容简介：
潘家口两座雄关没入水中它们犹如巨龙潜渊形成独特的“水下长城”景观2012年8月13日，一船只从城墙边驶过。20世纪七八十年代潘家口水库建成后喜峰口、衡丙三在长城上巡查。为加强长城保护当地不仅专门筹款进
