A group of about forty islands in the western Pacific, part of Papua New Guinea.
阿德默勒尔蒂群岛（西太平洋中包含约40个岛的岛群，是巴布亚新几内亚的一部分）
Definition of Admiralty Islands in US English:
Admiralty Islands
proper nounˌadmərəltē ˈīləndz
A group of about 40 islands in the western Pacific, part of Papua New Guinea. In 1884 the islands became a German protectorate, but after 1920 they were administered as an Australian mandate.