petroleum lubricating grease

例句：

1. 1. The petroleum industry is a major contributor to the economy.
   石油工业是经济的主要贡献者。
2. 2.Petroleum is a finite resource that must be used wisely.
   石油是一种有限的资源，必须明智使用。
3. 3. The discovery of new oil reserves has boosted the country's economy.
   新油藏的发现促进了该国的经济。
4. 1. The engine needs lubricating oil to run smoothly.
   发动机需要润滑油才能顺畅运行。
5. 2. The machine was lubricated with a special grease before being put into operation.
   机器在投入运行前被涂上了一种特殊的油脂。
6. 3. Lubricating grease is essential for preventing friction and wear in machinery.
   润滑脂对于防止机械摩擦和磨损至关重要。