lubricating function

例句：

1. 1.The engine needs lubricating oil to run smoothly.
   发动机需要润滑油才能顺畅运行。
2. 2.Lubricating grease is used to prevent the metal parts from rubbing against each other.
   润滑脂用于防止金属部件相互摩擦。
3. 3.The car's engine requires regular lubrication to maintain its performance.
   汽车的发动机需要定期润滑以保持其性能。