A trouper makes preparation for the performance of "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)  

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) 

A trouper makes preparation for the performance of "gaoshan" opera in Yulong Township of 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) 

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) 

Villagers watch "gaoshan" opera performance 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) 

A trouper performs "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)