hammered piston ring

例句：

1. 1. Theengine's performance was significantly improved by replacing the old, worn-out piston rings with new ones.
   通过更换旧的磨损的活塞环，发动机的性能得到了显著提升。
2. 2. The technician carefully inspected each component to ensure that the pistonrings were correctly installed and functioning properly.
   技术员仔细检查了每一个部件，确保活塞环正确安装并正常工作。
3. 3.The sound of the engine was replaced by a louder, more mechanical noise as the piston rings were being hammered into place.
   随着活塞环被锤击到位，发动机的声音变成了更响亮、更机械性的噪音。