tuning bar

例句：

1. 1. The engineer used a tuning bar to tune the car's engine.
   工程师使用一个调校杆来调校汽车的引擎。
2. 2.The tuning bar was adjusted to ensure optimal performance.
   调校杆被调整以确保最佳性能。
3. 3.The tuning bar is essential for maintaining the proper balance of the instrument.
   调校杆对于保持乐器的正确平衡至关重要。