Troupers perform "gaoshan" opera in Guanyinba Village of Yulong Township in Longnan, northwest China's Gansu Province, Feb. 6, 2017. "Gaoshan" opera, which originated in Yulong, has a history of about 700 years. It was listed as one of the national intangible cultural heritages in 2008. (Xinhua/Cai Yang)
