Exhibition titled "The Qin Dynasty's Unification of China" held in Xi'an

Photo taken on Dec. 5, 2019 shows a terracotta warrior with stone helmet displayed at an exhibition titled "The Qin Dynasty's Unification of China" at Emperor Qinshihuang's Mausoleum Site Museum in Xi'an, northwest China's Shaanxi Province. (Xinhua/Li Yibo)