A key is the part of a pianoforte that you touch to make music.

琴键是钢琴上用手的部件,它能使钢琴发出乐音。

Conlusion Musicotherapy is effective in curing senile Tinnitus,It is suitable to be widely introduced into use...

结论乐音疗法对老年性耳鸣有显疗效,宜于推广应用。