descant
n
(music 音) treble accompaniment (often improvised) which is sung or played to a melody 高音部伴奏或伴唱(常為即興的). descant, v [Ipr]
~ on/upon sth
1 (music 音) sing or play a descant on sth 為某樂曲作高音伴奏或伴唱.
2 (fml 文) talk for a long time about sth; comment on sth 長時間談論某事; 評論某物
descant endlessly on the Government's failings 無盡無休地談論政府的過失.