tuning sharpness

例句：

1. 1.The radio was tuned to the correct frequency.
   收音机被调到正确的频率。
2. 2. The car's engine needs tuning for better performance.
   汽车的引擎需要调校以获得更好的性能。
3. 3. The instrument was tuned by a professional musician.
   这个乐器是由一位专业音乐家调校的。