BEIJING, July 12 (Xinhua) -- One November morning in 2019, Prokopis Pavlopoulos, then president of Greece, accompanied his guests -- Chinese President Xi Jinping and his wife Peng Liyuan -- and took a tour of the sun-lit Acropolis Museum, Athens. They talked about not only the exhibits at the museum -- artifacts found on the archaeological site of the Acropolis -- but also the ancient Greek civilization behind t