Aerial photo taken on April 29, 2019 shows the box girder installation site of Xixi bridge on new Fuzhou-Xiamen high-speed railway in Xiamen, southeast China's Fujian Province. The first box girder was installed here Monday, marking an important progress of building new Fuzhou-Xiamen high-speed railway. The new railway line is expected to put into service in 2022, with a designed speed of 350 kilometers per hour. (Xinhua/Song Weiwei)