A construction worker welds metal on the Yellow River Bridge, a section of the Yuncheng-Lingbao highway, May 10. The 1,690-meter bridge is a key bridge connecting Shanxi and Henan provinces as well as a vital part of the Hohhot-Beihai highway network. The bridge is being built using a two-way six-lane design, and the project is expected to be completed in October 2018. [Photo/Xinhua]