Tourists visit an exhibition featuring marine civilization of the South China Sea at Hainan Museum in Haikou, south China's Hainan Province, April 24, 2022. (Xinhua/Zhang Liyun)

　　Tourists visit an exhibition featuring marine civilization of the South China Sea at Hainan Museum in Haikou, south China's Hainan Province, April 24, 2022. (Xinhua/Zhang Liyun)

　　Tourists visit an exhibition featuring marine civilization of the South China Sea at Hainan Museum in Haikou, south China's Hainan Province, April 24, 2022. (Xinhua/Zhang Liyun)

　　Photo taken on April 24, 2022 shows the bluish-white glazed powder cases with stamped patterns at an exhibition featuring marine civilization of the South China Sea at Hainan Museum in Haikou, south China's Hainan Province. (Xinhua/Zhang Liyun)

　　Tourists visit an exhibition featuring marine civilization of the South China Sea at Hainan Museum in Haikou, south China's Hainan Province, April 24, 2022. (Xinhua/Zhang Liyun)