piston Tee ring

例句：

1. 1.The piston is the moving part that moves up and down inside the cylinder.
   活塞是气缸内上下移动的移动部分。
2. 2. The piston is responsible for transferring fuel from the engine to the combustion chamber.
   活塞负责将燃料从发动机传输到燃烧室。
3. 3. The piston is designed to reduce friction and improve efficiency in internal combustion engines.
   活塞设计用于减少摩擦并提高内燃机的效率。