润滑物

例句：

1. 1. The engine needs to be lubricated regularly to prevent wear.
   发动机需要定期润滑以防止磨损。
2. 2.The machine was lubricated with oil before being put into operation.
   机器在投入使用前被油润滑过。
3. 3. The car's brakes need to be lubricated frequently to ensure smooth stopping.
   汽车的刹车需要经常润滑以确保平稳停止。