riff
noun [ C ] uk/rɪf/ us/rɪf/
(REPEATED TUNE)
（爵士乐或流行音乐的）重复乐段
in jazz or popular music, a tune that continues or appears regularly in a piece of music while other parts change or are added
The song is punctuated by long guitar riffs. 这首歌中穿插着很长的吉他演奏的重复乐段。
riff
verb [ I ] uk/rɪf/ us/rɪf/
(PLAY MUSIC)
（爵士或流行乐）演奏乐曲的重复段
in jazz or popular music, to play a short, repeated series of notes
The singer growled over acoustic guitar while his bandmates riffed on banjo, ukulele, and fiddle. 歌手和着木吉他嘶吼着，他的乐队成员用班卓琴、尤克里里琴和小提琴演奏着乐曲的重复段。
(SPEAK)
长时间地（幽默地）谈论（某个话题）
to speak for a long time on a particular subject, especially in a humorous way
He strutted and riffed on topics from global warming to parenthood. 他在各种话题上高谈阔论，妙语连珠：从全球变暖谈到为人父母之道。