May 8th marks the World Smile Day, a global festival established by the World Mental Health Organization in 1948 to celebrate the human expression. Smile is universal, so is peace. Check out these smiling moments from Chinese peacekeepers. They are assigned to the 11th Chinese Peacekeeping Infantry Battalion to the United Nations Mission in South Sudan (UNMISS). (eng.chinamil.com.cn/Photo by Lu Chenchen, Wang Kunbo and Li Ziyang)