two ring piston

例句：

1. 1.The engine uses a double ring piston to reduce friction and increase efficiency.
   发动机使用双环活塞来减少摩擦并提高效率。
2. 2.The design of the piston is crucial for the performance of the engine.
   活塞的设计对发动机的性能至关重要。
3. 3. The piston rings are made of high-quality materials to ensure longevity and durability.
   活塞环由高质量的材料制成，以确保持久性和耐用性。