这首歌的开头有一段很酷的重复吉他旋律。

The song starts with a cool guitar ___riff.

吉他手在舞台上即兴演奏了一段重复的旋律。

The guitarist ___riffed a repeating melody on stage.

他在餐桌上关于办公室文化的即兴妙语逗得大家哈哈大笑。

His hilarious ___riff about office culture at dinner made everyone burst out laughing.