Xinhua photos of the day

Aerial photo taken on Dec. 16, 2019 shows a bullet train running on the Xixi River grand bridge of the Chengdu-Guiyang railway in southwest China's Guizhou Province. The 648-km-long Chengdu-Guiyang high-speed rail line, an important part of China's ambitious plan to build a high-speed railway network across the country, was launched on Monday. (Xinhua/Yang Wenbin)