定弦的英文：
tune up
The range is normally five octaves, and sometimes four in special cases.
一般以五度定弦，为特殊用途，也可用四度定弦。
n. 曲调；歌曲；和谐；调谐；心情；语调
v. 为（乐器）调音；调台，调谐；调试，调整；使和谐，使一致
Our grand is in good tune.
我们的大钢琴音很准。
Every pipe is voiced and tuned.
每支音管都要修音调律。
change one's tune
1.改变态度
the piano was jarringly out of tune.
钢琴走了调，声音很刺耳。
To put(an instrument) into correct tune.
调（乐器）的音，为…调音将（乐器）音调调至正确