好,进入正题。(相关注释来源于百科和知乎上作者Gabriella Wang部分见解) 第九集标题, the Well-tempered Clavier--《平均律钢琴曲集》 The Well-Tempered Clavier is a collection of two series of Preludes and Fugues in all major and minor keys, composed for solo keyboard by Johann Sebastian Bach. In the German of Bach's time Clavier (keyboard) was a generic name indicating a variety of keyboard instruments. --Wikipedia