trio
/ˈtriːəʊ/noun
(pl. -os)
1- a set or group of three people or things三人组, 三件套：
the hotel was run by a trio of brothers.
这个旅店由兄弟三人管理。
1.1
- a group of three musicians三重奏：
a jazz trio.
爵士乐三重奏。
1.2
- a composition written for three musicians三重奏曲：
Chopin's G minor Trio.
肖邦的G小调三重奏曲。
1.3
- the central, typically contrastive, section of a minuet, scherzo, or march（尤指对比的）中段（小步舞曲、谐谑曲或进行曲）。
1.4
- (in piquet) a set of three aces, kings, queens, jacks, or tens held in one hand（皮克牌戏中同在一人手里的）三张A（或K、Q、J、10）。
词源
early 18th cent.: from Italian, from Latin tres 'three', on the pattern of duo.