Photo taken on April 20, 2021 shows workers carry out construction on the grand bridge of Guiyang-Nanning high-speed railway in Dushan County, southwest China's Guizhou Province. Guiyang-Nanning high-speed railway is designed with a maximum speed of 350 km per hour. (Photos: Xinhua)

Workers spray water on prefabricated components for the construction of Guiyang-Nanning high-speed railway in Dushan County, southwest China's Guizhou Province, April 20, 2021. Guiyang-Nanning high-speed railway is designed with a maximum speed of 350 km per hour.

Aerial photo taken on April 20, 2021 shows workers carry out construction on the grand bridge of Guiyang-Nanning high-speed railway in Dushan County, southwest China's Guizhou Province. Guiyang-Nanning high-speed railway is designed with a maximum speed of 350 km per hour.

Aerial photo taken on April 21, 2021 shows workers carry out construction on the grand bridge of Guiyang-Nanning high-speed railway in Dushan County, southwest China's Guizhou Province. Guiyang-Nanning high-speed railway is designed with a maximum speed of 350 km per hour.

Aerial photo taken on April 21, 2021 shows workers carry out construction on the grand bridge of Guiyang-Nanning high-speed railway in Dushan County, southwest China's Guizhou Province. Guiyang-Nanning high-speed railway is designed with a maximum speed of 350 km per hour.