故宫是中国历史文化最具代表性的建筑,如此庞大的建筑结构体系不禁使人感慨先人的智慧与建筑技巧。11月4日,北京科技大学机械工程学院副教授李疆、清华大学摩擦学国家重点实验室副研究员陈皓生及普林斯顿大学机械与航空工程系教授霍华德·斯通在美国《国家科学院学报》上发表研究报告,指出中国古代兴建故宫时,曾制造人造冰道,并以水为润滑剂, The Forbidden City is the most representative building of Chinese history and culture. Such a huge building structure system can not help but feel the wisdom and architectural skills of its predecessors. On November 4, Li Jiang, associate professor of School of Mechanical Engineering, Beijing University of Science and Technology, Chen Haosheng, associate researcher of State Key Laboratory of Tribology, Tsinghua University, and Howard Stone, professor of Mechanical and Aeronautical Engineering of Princeton University published a research report in Proceedings of the National Academy of Sciences , Pointed out that in ancient China when the Forbidden City was built, it had manufactured artificial ice paths and used water as a lubricant.