People visit the Anhui Geological Museum in Hefei, capital of east China's Anhui Province, March 27, 2020. Anhui Geological Museum, which had been closed amid concerns over the COVID-19 epidemic, was reopened in an orderly manner on Friday to visitors who have made real-name reservations and to control the number of visitors below 1,000 a day. (Photo by Huang Bohan/Xinhua)

A man visits the Anhui Geological Museum in Hefei, capital of east China's Anhui Province, March 27, 2020. Anhui Geological Museum, which had been closed amid concerns over the COVID-19 epidemic, was reopened in an orderly manner on Friday to visitors who have made real-name reservations and to control the number of visitors below 1,000 a day. (Photo by Huang Bohan/Xinhua)

People visit the Anhui Geological Museum in Hefei, capital of east China's Anhui Province, March 27, 2020. Anhui Geological Museum, which had been closed amid concerns over the COVID-19 epidemic, was reopened in an orderly manner on Friday to visitors who have made real-name reservations and to control the number of visitors below 1,000 a day. (Photo by Huang Bohan/Xinhua)

A child visits the Anhui Geological Museum in Hefei, capital of east China's Anhui Province, March 27, 2020. Anhui Geological Museum, which had been closed amid concerns over the COVID-19 epidemic, was reopened in an orderly manner on Friday to visitors who have made real-name reservations and to control the number of visitors below 1,000 a day. (Photo by Huang Bohan/Xinhua)

A man visits the Anhui Geological Museum in Hefei, capital of east China's Anhui Province, March 27, 2020. Anhui Geological Museum, which had been closed amid concerns over the COVID-19 epidemic, was reopened in an orderly manner on Friday to visitors who have made real-name reservations and to control the number of visitors below 1,000 a day. (Photo by Huang Bohan/Xinhua)

People visit the Anhui Geological Museum in Hefei, capital of east China's Anhui Province, March 27, 2020. Anhui Geological Museum, which had been closed amid concerns over the COVID-19 epidemic, was reopened in an orderly manner on Friday to visitors who have made real-name reservations and to control the number of visitors below 1,000 a day. (Photo by Huang Bohan/Xinhua)