piston ring side

例句：

1. 1. The piston ring side was the most critical part of the engine's operation.
   活塞环侧是发动机运作最关键的部分。
2. 2.During maintenance, the technician carefully inspected the piston ring side for signs of wear.
   在维护期间，技术人员仔细检查了活塞环侧，寻找磨损的迹象。
3. 3. The piston ring side is where the engine seals against the cylinder wall during compression.
   活塞环侧是在压缩过程中，发动机与气缸壁密封的地方。