piston ring side clearance

例句：

1. 1. The piston ringside clearance is critical for engine performance.
   活塞环侧间隙对发动机性能至关重要。
2. 2. Maintenance of the piston ring side clearanceis essential for engine longevity.
   保持活塞环侧间隙的维护对于发动机的持久性至关重要。
3. 3. The manufacturer has increased thepiston ring side clearance to improve fuelefficiency.
   制造商已提高活塞环侧间隙以提升燃油效率。