Xinhua | December 24, 2024
Trucks pass through a road section of the Qinghai-Xizang Highway built on permafrost flanked by metal pipes, which serve as conductive heat pipes to stabilize the temperature of the permafrost layer, on the Qinghai-Xizang Plateau in northwest China's Qinghai Province, Dec. 2, 2024. (Xinhua/Jiang Fan)