Core Viewpoint - The article highlights the dedication of three Great Wall protectors in Qinhuangdao, showcasing their efforts in preserving this historical monument through various methods, including traditional and modern techniques. Group 1: Individual Contributions - Zhang Heshan has been patrolling the Great Wall for over 40 years, covering 6 kilometers daily and inspecting 23 watchtowers, emphasizing the importance of his role in maintaining the structure and its cultural significance [7][8]. - Zhang Peng, the leader of the Shanhaiguan Great Wall Volunteer Service Team, utilizes drones and technology to enhance the efficiency of patrols and protect the wall from illegal activities [9][10]. - Xu Guohua, a protector for over 20 years, discovered ancient brick kilns near the Banchangyu Great Wall, revealing the historical significance of the area and its role in Great Wall construction [11]. Group 2: Technological Integration - The integration of technology, such as drones and data analysis, allows for more effective monitoring and protection of the Great Wall, improving the response to potential threats [10]. - Zhang Peng's use of drones has significantly increased the efficiency of patrols, especially in difficult terrains, allowing for quicker reporting and response to illegal activities [10]. Group 3: Cultural Significance - The Great Wall is not only a physical structure but also a cultural symbol, with protectors like Zhang Heshan and Xu Guohua emphasizing the importance of preserving its history and stories [8][11]. - The discovery of ancient brick kilns by Xu Guohua highlights the historical context of the Great Wall's construction, showcasing the area's significance in military and architectural history [11].

Core Viewpoint - The article highlights the dedication of individuals in protecting the Great Wall, showcasing their various methods and the importance of cultural preservation in this effort [1][10]. Group 1: Individual Contributions - Zhang Heshan, a long-time protector of the Great Wall, has walked over 100,000 kilometers in 40 years, inspecting 23 watchtowers built during the Ming Dynasty [2][3]. - Zhang's daily routine includes clearing weeds, cleaning up litter, and educating visitors about the Great Wall, reflecting his deep commitment to its preservation [3][8]. - Zhang has faced various challenges during his patrols, including encounters with wildlife and the need to document local folklore related to the Great Wall [3][10]. Group 2: Technological Integration - Zhang Peng, a leader of a volunteer service team, utilizes drones for monitoring the Great Wall, enhancing the efficiency of inspections, especially in difficult terrains [7][8]. - The use of drones allows for comprehensive aerial assessments of the wall, which is crucial for identifying areas needing repair and for reporting illegal activities [8][10]. Group 3: Cultural Heritage and Education - Xu Guohua, another protector, emphasizes the importance of traditional brick-making techniques and the historical significance of the Great Wall, which serves as a cultural symbol for the local community [10][11]. - The discovery of ancient brick kilns near the Great Wall has provided insights into its construction and has become a focal point for educational activities, attracting tourists and students alike [10][11].