Actors perform a dance during the opening ceremony of the 4th Silk Road International Arts Festival in Xi'an, capital of northwest China's Shaanxi Province, Sept. 7, 2017. The festival will be held on Sept. 7-21, with the participation of artists from over 20 countries and regions. (Xinhua/Liu Xiao)

Actors perform a dance during the opening ceremony of the 4th Silk Road International Arts Festival in Xi'an, capital of northwest China's Shaanxi Province, Sept. 7, 2017. The festival will be held on Sept. 7-21, with the participation of artists from over 20 countries and regions. (Xinhua/Liu Xiao)

Actors perform a dance during the opening ceremony of the 4th Silk Road International Arts Festival in Xi'an, capital of northwest China's Shaanxi Province, Sept. 7, 2017. The festival will be held on Sept. 7-21, with the participation of artists from over 20 countries and regions. (Xinhua/Liu Xiao)

Actors perform a dance during the opening ceremony of the 4th Silk Road International Arts Festival in Xi'an, capital of northwest China's Shaanxi Province, Sept. 7, 2017. The festival will be held on Sept. 7-21, with the participation of artists from over 20 countries and regions. (Xinhua/Liu Xiao)

Actors perform a dance during the opening ceremony of the 4th Silk Road International Arts Festival in Xi'an, capital of northwest China's Shaanxi Province, Sept. 7, 2017. The festival will be held on Sept. 7-21, with the participation of artists from over 20 countries and regions. (Xinhua/Liu Xiao)

Actors from Bulgaria perform a dance during the opening ceremony of the 4th Silk Road International Arts Festival in Xi'an, capital of northwest China's Shaanxi Province, Sept. 7, 2017. The festival will be held on Sept. 7-21, with the participation of artists from over 20 countries and regions. (Xinhua/Liu Xiao)

Actors perform during the opening ceremony of the 4th Silk Road International Arts Festival in Xi'an, capital of northwest China's Shaanxi Province, Sept. 7, 2017. The festival will be held on Sept. 7-21, with the participation of artists from over 20 countries and regions. (Xinhua/Liu Xiao)