The construction of the largest and most magnificent palace was very difficult at that time, and the protection and maintenance alone during the past 500 years has been very difficult too, requiring numerous designers and builders to work their heart out.

• 这个迄今最完整、规模最大且雄伟壮丽的古代宫廷建筑群，莫说在当年动工兴建时实属不易，就是这500多年来的维修保护工程，也不知耗费了多少能工巧匠们的心血和殚精竭虑的努力。