Towers of the world's longest cross-sea bridge, which connects Zhuhai in Guangdong Province with Hong Kong and Macao, are seen in Zhuhai, south China's Guangdong Province, Sept. 27, 2016. A ceremony was held Tuesday in Zhuhai to celebrate completion of the 55-km cross-sea route and beginning of the assembly of the bridge floor and related work. (Xinhua/Liang Xu)