Question: Is it difficult to protect and maintain historical buildings? Analysis: Analyze the challenges of protecting historical buildings from economic, technical, and socio-cultural factors. Discuss the complexity and cost of repairing old buildings. Mention the level of importance society places on protecting historical heritage and the influence of policies.

问题：保护和维护历史建筑困难吗？ 解析： 从经济、技术和社会文化因素上分析保护历史建筑的挑战。 讨论维修老建筑的复杂性和成本。 提到社会对保护历史遗产的重视程度和政策的影响。