quartet
n
1 (piece of music for) four players or singers 四重奏(曲); 四重唱(曲); 四重奏演奏者; 四重唱演唱者
a string quartet, ie players of or music for two violins, a viola and a cello 弦樂四重奏(兩個小提琴、 一個中提琴和一個大提琴的演奏者或其樂曲).
2 set of four people or things 四人一組; 四件一套
a quartet of novels with a linking theme 主題連貫的四部小說.