Olympic champion swimmer Sun Yang appears at CAS hearing in Switzerland

MONTREUX, Switzerland, Nov. 15 (Xinhua) -- Three-time Chinese Olympic champion swimmer Sun Yang appeared at a public hearing in the Court of Arbitration for Sport (CAS) in Montreux, Switzerland, on Friday, as the World Anti-Doping Agency (WADA) appealed against Sun Yang and FINA over FINA's previous decision in favor of Sun on his alleged anti-doping rule violations.