flexible oil piston ring

例句：

1. 1.The flexible oil piston ring helps to reduce friction and improve engine efficiency.
   这种灵活的油活塞环有助于减少摩擦并提高发动机效率。
2. 2.The manufacturer claims that the flexible oil piston ring can effectively seal the gap between the piston and the cylinder wall.
   制造商声称这种灵活的油活塞环能有效密封活塞与气缸壁之间的间隙。
3. 3.Due to its flexibility, the oil piston ring can be easily replaced without affecting the overall performance of the engine.
   由于其灵活性，油活塞环可以很容易地更换，而不会损害发动机的整体性能。