Foreign students studying in Liaocheng University listen to an introduction of a Peking Opera mask in Liaocheng, east China's Shandong Province, June 9, 2011. Foreign students were invited by local artists Yang Xueguang, a Peking Opera amateur, to have a real taste of Peking Opera and its various masks at his home, prior to the country's sixth Cultural Heritage Day falling on June 11, 2011.