lubricating oil

例句：

1. 1.This engine needs a lubricating oil to keep it running smoothly.
   这台发动机需要润滑油来保持顺畅运行。
2. 2.The car's engine is running fine without any lubricating oil.
   汽车的发动机在没有润滑油的情况下运行得很好。
3. 3.Lubricating oil is essential for preventing the wear and tear of moving parts.
   润滑油对于防止移动部件磨损至关重要。