A judge introduces the rules during a skill competition for workers from Shanghai Cooperation Organization (SCO) member countries in Langfang, north China's Hebei Province, Nov. 10, 2017. The 18th Shanghai Cooperation Organization (SCO) Summit is scheduled for June 9 to 10 in Qingdao, a coastal city in east China's Shandong Province. Since China took over the rotating presidency of the SCO last June, more than 160 activities including a series of important institutional meetings and multilateral events have been held so far. (Xinhua/Zhang Cheng)