Troupers of "gaoshan" opera walk along a path in Wanggou Village of Yulong Township in Longnan, northwest China's Gansu Province, Feb. 7, 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)
