flat oil stone

例句：

1. 1. The flat oil stone isused to polish the surface of the car.
   平油石用于汽车表面的抛光。
2. 2. The flatoil stone is a common tool in carmaintenance.
   平油石是汽车维护中常见的工具。
3. 3. The flat oil stone is essential forremoving rust from metal surfaces.
   平油石对于去除金属表面锈迹至关重要。