Workers of China Zhongtie Major Bridge Engineering Group Co., Ltd. construct a main pylon pier of a cross-sea bridge in Pingtan Strait, East China's Fujian Province Aug. 3, 2015. Being the first of its kind in China, the railway and highway combined cross-sea bridge in Pingtan Strait has two layers, one for railway from Fuzhou to Pingtan, the other for highway from Changle to Pingtan. The cross-sea bridge spans 16.45 km and will open to traffic in 2019. [Photo/Xinhua]