piston ring machine

例句：

1. 1. This piston ringmachine is designed to precisely form the piston rings for high-performance engines.
   这台活塞环机设计用来为高性能发动机精确地形成活塞环。
2. 2. The pistonring machine has been upgraded to improveits efficiency and reduce maintenance costs.
   活塞环机已经升级，以提高其效率并减少维护成本。
3. 3. The piston ring machine isa crucial tool in the manufacturing process ofautomotive engines.
   活塞环机是汽车发动机制造过程中的一个关键工具。