Photo taken on Oct. 11, 2020 shows the construction site of Baquhe super major bridge along Changde-Yiyang-Changsha railway, in central China's Hunan Province. The 157-kilometer high-speed railway line, connecting the cities of Changde, Yiyang and Changsha in Hunan Province with a designed speed of 350 kilometers per hour, is an important part in China's high-speed railway network. (Xinhua/Du Huaju)

A worker monitors beam installation at the construction site of Baquhe super major bridge along Changde-Yiyang-Changsha railway, in central China's Hunan Province, Oct. 11, 2020. The 157-kilometer high-speed railway line, connecting the cities of Changde, Yiyang and Changsha in Hunan Province with a designed speed of 350 kilometers per hour, is an important part in China's high-speed railway network. (Xinhua/Du Huaju)

Aerial photo taken on Oct. 11, 2020 shows the construction site of Baquhe super major bridge along Changde-Yiyang-Changsha railway, in central China's Hunan Province. The 157-kilometer high-speed railway line, connecting the cities of Changde, Yiyang and Changsha in Hunan Province with a designed speed of 350 kilometers per hour, is an important part in China's high-speed railway network. (Xinhua/Du Huaju)

Aerial photo taken on Oct. 11, 2020 shows the construction site of Baquhe super major bridge along Changde-Yiyang-Changsha railway, in central China's Hunan Province. The 157-kilometer high-speed railway line, connecting the cities of Changde, Yiyang and Changsha in Hunan Province with a designed speed of 350 kilometers per hour, is an important part in China's high-speed railway network. (Xinhua/Du Huaju)

Aerial photo taken on Oct. 11, 2020 shows the construction site of Baquhe super major bridge along Changde-Yiyang-Changsha railway, in central China's Hunan Province. The 157-kilometer high-speed railway line, connecting the cities of Changde, Yiyang and Changsha in Hunan Province with a designed speed of 350 kilometers per hour, is an important part in China's high-speed railway network. (Xinhua/Du Huaju)

Photo taken on Oct. 11, 2020 shows the construction site of Baquhe super major bridge along Changde-Yiyang-Changsha railway, in central China's Hunan Province. The 157-kilometer high-speed railway line, connecting the cities of Changde, Yiyang and Changsha in Hunan Province with a designed speed of 350 kilometers per hour, is an important part in China's high-speed railway network. (Xinhua/Du Huaju)