A girl presents a hada, a strip of raw silk or linen that conveys good blessings, to her teacher who is singing on a stage at an elementary school in Maqin County of Guoluo Tibetan Autonomous Prefecture of northwest China's Qinghai Province, Sept. 10, 2015. A series of events are held here to celebrate the 31st Teacher's Day of China. (Xinhua/Wu Gang)