Graduates of Xi'an University of Architecture and Technology pose for a group photo in front of the Yongning Gate in Xi'an, northwest China's Shaanxi Province, June 25, 2019. More than 500 graduate representatives from over 30 colleges and universities in Xi'an took part in a graduation ceremony held at the Yongning Gate on Tuesday. (Xinhua/Liu Xiao)

Graduates head for the Yongning Gate during a graduation ceremony in Xi'an, northwest China's Shaanxi Province, June 25, 2019. More than 500 graduate representatives from over 30 colleges and universities in Xi'an took part in a graduation ceremony held at the Yongning Gate on Tuesday. (Xinhua/Liu Xiao)

Photo taken on June 25, 2019 shows a graduation ceremony in Xi'an, northwest China's Shaanxi Province. More than 500 graduate representatives from over 30 colleges and universities in Xi'an took part in a graduation ceremony held at the Yongning Gate on Tuesday. (Xinhua/Liu Xiao)

Graduates attend a graduation ceremony in Xi'an, northwest China's Shaanxi Province, June 25, 2019. More than 500 graduate representatives from over 30 colleges and universities in Xi'an took part in a graduation ceremony held at the Yongning Gate on Tuesday. (Xinhua/Liu Xiao)

Graduates of Shaanxi Normal University pose for a group photo during a graduation ceremony in Xi'an, northwest China's Shaanxi Province, June 25, 2019. More than 500 graduate representatives from over 30 colleges and universities in Xi'an took part in a graduation ceremony held at the Yongning Gate on Tuesday. (Xinhua/Liu Xiao)

Graduates head for the Yongning Gate during a graduation ceremony in Xi'an, northwest China's Shaanxi Province, June 25, 2019. More than 500 graduate representatives from over 30 colleges and universities in Xi'an took part in a graduation ceremony held at the Yongning Gate on Tuesday. (Xinhua/Liu Xiao)