Aerial photo taken on July 15, 2020 shows the construction site of the Nandu River grand bridge of the Wenchang-Lingao national road in Chengmai County of south China's Hainan Province. Workers have speeded up bridge-pile building at the construction site of the Nandu River grand bridge of the Wenchang-Lingao national road, which links Wenchang City and Lingao County of Hainan with a length of 121.88 km. (Xinhua/Yang Guanyu)
