Aerial photo taken on March 6, 2022 shows a construction site of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province.(Xinhua/Yang Wenbin)

Aerial photo taken on March 6, 2022 shows the two-lane Lagan Grand Bridge of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province.(Xinhua/Yang Wenbin)

Aerial photo taken on March 6, 2022 shows a construction site of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province.(Xinhua/Yang Wenbin)

Aerial photo taken on March 5, 2022 shows the two-lane Yingpan Qingshui River Grand Bridge of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province.(Xinhua/Yang Wenbin)

Aerial panoramic photo taken on March 6, 2022 shows the two-lane Lajuan Grand Bridge of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province.(Xinhua/Yang Wenbin)

Laborers work at a construction site of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province, March 6, 2022.(Xinhua/Yang Wenbin)

Laborers work at a construction site of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province, March 6, 2022.(Photo by Xiao Wei/Xinhua)

Aerial photo taken on March 5, 2022 shows a construction site of the Guiyang-Nanning high-speed railway in southwest China's Guizhou Province.(Photo by Xiao Wei/Xinhua)