The opening ceremony of China's main venue of "May 18 International Museum Day" in 2020 was held in Nanjing MuseumThe opening ceremony of China's main venue of "May 18 International Museum Day" in 2020 was held in Nanjing MuseumThe opening ceremony of China's main venue of "May 18 International Museum Day" in 2020 was held in Nanjing MuseumThe opening ceremony of China's main venue of "May 18 International Museum Day" in 2020 was held in Nanjing MuseumThe opening ceremony of China's main venue of "May 18 International Museum Day" in 2020 was held in Nanjing MuseumThe opening ceremony of China's main venue of "May 18 International Museum Day" in 2020 was held in Nanjing Museum