The photo shows Huanggang Yangtze River Bridge, the sixth railway-highway bridge across the Yangtze River, as well as the bridge with the largest span of the kind in the world, in Huanggang, Hubei Province, on September 16, 2012. Its closure of the main span steel girder has been finished. The bridge, which is designed to span four kilometers, is expected to put into operation by 2014. [Xinhua]