More than 4,000 years ago, when the Egyptian pharaohs were obsessed with building the pyramids, China's Dayu was conducting "geographical expeditions." Both official and unofficial Chinese history records that Dayu burned the results of his inspections on the Jiuding. Strangely, the Jiuding that recorded important secrets disappeared mysteriously in the hands of Qin Shihuang... More than 2,000 years ago, I hid a large number of ancient classics, ritual vessels, and sacrificial vessels from the Xia, Shang, and Zhou dynasties. What are I afraid of? Western explorers have "explored" into China many times. What is their real purpose?