casing for spark adjustment

例句：

1. 1. The car needs to beserviced regularly to ensure optimal performance.
   这辆车需要定期维护，以确保最佳性能。
2. 2. Themechanic adjusted the spark plugs to improvefuel efficiency.
   机械师调整了火花塞以提高燃油效率。
3. 3. The new engine design uses amore advanced casing for spark adjustment, resulting in better performance.
   新型发动机设计采用了更先进的火花调节套，从而获得了更好的性能。