gear pair with shaft angle modification

例句：

1. 1. The car's engine needs to be adjusted for better performance.
   这辆车的引擎需要调整以获得更好的性能。
2. 2. The new gearbox has made driving smoother and more efficient.
   新的变速箱使得驾驶更加顺畅和高效。
3. 3. The gears on the clock are finely tuned to ensure accurate timekeeping.
   钟表上的齿轮被精细调整，以确保准确的时间显示。