diapason normal meaning in English

国际标准音高

Piano timing is based on diapason normal and " the twelve melody of averages " and certain programs of musical rules as well as auditively distinguished " beat note " and it uses some instruments to adjust the tension of the piano ' s strings and the normal functioning of a piano ' s key mechanism
摘要钢琴调律是以国际标准音高，以律学中的“十二平均律”为理论依据，以一定的生律程序、以听觉分辨“拍音”为判断依据，使用专用工具对琴弦的强力及机件的合理运动进行调整。