Visitors view exhibits at an exhibition on change and development of society in commemoration of the 70th anniversary of the founding of the People's Republic of China (PRC) in Changsha Museum in Changsha, central China's Hunan Province, Oct. 17, 2019. The exhibition will last until Dec. 24. (Xinhua/Chen Zeguo)

A guide explains to visitors at an exhibition on change and development of society in commemoration of the 70th anniversary of the founding of the People's Republic of China (PRC) in Changsha Museum in Changsha, central China's Hunan Province, Oct. 17, 2019. The exhibition will last until Dec. 24. (Xinhua/Chen Zeguo)

Visitors take photos at an exhibition on change and development of society in commemoration of the 70th anniversary of the founding of the People's Republic of China (PRC) in Changsha Museum in Changsha, central China's Hunan Province, Oct. 17, 2019. The exhibition will last until Dec. 24. (Xinhua/Chen Zeguo)

A visitor views exhibits at an exhibition on change and development of society in commemoration of the 70th anniversary of the founding of the People's Republic of China (PRC) in Changsha Museum in Changsha, central China's Hunan Province, Oct. 17, 2019. The exhibition will last until Dec. 24. (Xinhua/Chen Zeguo)