1 Detinition of tone Tones are pitch variations, Which are caused by the differing rates of vibration of the vocal cords 声调是由于声带振动的速率的不同而引起的 音高变化1. Definition of tone Tones are pitch variations, which are caused by the differing rates of vibration of the vocal cords. 声调是由于声带振动的速率的不同而引起的 音高变化