A volunteer (L) from the quake-hit Yushu Tibetan Autonomous Prefecture interprets for the doctor at the 1st affiliated hospital of Xi'an Jiaotong University in Xi'an, northwest China's Shannxi province, April 18, 2010. Many volunteers of the Tibetan ethnic group supplied oral interpretation service in hospitals in Xi'an, where injured people from the quake-hit Yushu Tibetan Autonomous Prefecture of northwest China's Qinghai Province are treated. [Xinhua]