ring lubricator

例句：

1. 1. The ringlubricator is used to reducefriction between moving parts.
   环形润滑器用于减少移动部件之间的摩擦。
2. 2. Theengineer designed the ring lubricator to improve efficiency.
   工程师设计了环形润滑器以提高效率。
3. 3. The ring lubricator wasa revolutionary invention that changed the way machineswere operated.
   环形润滑器是一项革命性的发明，改变了机器的运行方式。