Chen Ping (L), head of National Centre for the Performing Arts of China, gives a gift to Michael Nutter, mayor of Philadelphia, at the City Hall in Philadelphia, the United States, on Nov. 6, 2014. The China National Centre for the Performing Arts Orchestra gave a performance in Philadelphia on Thursday, as part of the orchestra's 12-day tour to seven cities in North America. (Xinhua/Liang Menglong)