Aerial photo taken on May 19, 2020 shows a bridge under construction over the Yellow River in Zhengzhou, central China's Henan Province. The 2016-meter-long bridge joined together on Tuesday. The upper floor is a six-lane expressway while the lower floor is a four-track railway. The bridge is a part of the railway line from Zhengzhou to Jinan, east China's Shandong Province. (Xinhua/Zhu Xiang)