This aerial drone photo shows visitors on the naval vessel Shenzhen during an open day activity at a port in Shenzhen of south China's Guangdong Province, Oct. 1, 2024. (Photo by Ji Xiang/Xinhua)

　　An aerial drone photo shows visitors on the naval vessel Tangshan during an open day activity at a port in Qingdao of east China's Shandong Province, Oct. 1, 2024. (Photo by Ma Yubin/Xinhua)

　　Visitors pose for a photo during an open day activity of Chinese naval ships in Qingdao of east China's Shandong Province, Oct. 1, 2024. (Xinhua/Li Bingxuan)

　　People line up to get on board a naval ship during an open day activity at a port in Qingdao of east China's Shandong Province, Oct. 1, 2024. (Xinhua/Li Bingxuan)

　　People visit on board a naval ship during an open day activity in Qingdao of east China's Shandong Province, Oct. 1, 2024. (Photo by Ma Yubin/Xinhua)