to tune up
例子
Before the concert, the guitarist took a moment to tune up his instrument.
音乐会开始前，吉他手花了一点时间来调音他的乐器。
The piano had n't been played in years, so it needed a professional to tune it up.
这架钢琴已经多年没有弹奏了，所以需要专业人士来调音。
02
调整, 调校
adjust for (better) functioning
