Aerial photo taken on Dec. 31, 2019 shows the Chuanhai Bridge over the Huangshui River in the junction area of Lanzhou City in Gansu Province and Haidong City in Qinghai Province, northwest China. Featuring a six-lane dual carriageway with the design speed of 40 kph, the 1,656-meter-long and 31-meter-wide bridge opened to traffic on Tuesday. (Xinhua/Zhang Long)