“双音”用英语怎么说

单音调 、 双音调和三音调已被充分讲解.Single, Dual and Tri Tones have been defined in full.可以演奏双音.Double tones can be played on it.钢琴的旋律, 由单线条到双音, 再转化为[音丛].The melody of the piano develops from line, through intervals, to the tone cluster...