(251222) -- CHENGDU, Dec. 22, 2025 (Xinhua) -- This undated combo photo shows front, back and side views of a stone artifact unearthed from the Tsungqen Co site in Daocheng County, Garze Tibetan Autonomous Prefecture, southwest China's Sichuan Province. TO GO WITH "China Focus: Chinese researchers uncover record-high evidence of ancient human activity on eastern Qinghai-Tibet Plateau" (Sichuan Provincial Cultural Relics and Archaeology Research Institute/Handout via Xinhua)