润滑的

例句：

1. 1. The engine needs to be lubricated regularly to prevent wear and tear.
   发动机需要定期润滑以防止磨损。
2. 2. The old car's gears need to be lubricated to keep them running smoothly.
   这辆旧车的齿轮需要润滑，以保持顺畅运行。
3. 3. The oil in the engine needs to be lubricated regularly to maintain its performance.
   发动机中的油需要定期润滑，以保持其性能。