The commissioning ceremony of Shandong aircraft carrier is held at a naval port in Sanya, south China's Hainan Province, Dec. 17, 2019. China's first domestically built aircraft carrier, the Shandong, was delivered to the People's Liberation Army (PLA) Navy and placed in active service on Dec. 17 at a naval port in Sanya. The new aircraft carrier, named after Shandong Province in east China, was given the hull number 17. (Xinhua/Li Gang)