pair of rollers

例句：

1. 1. Thepair of rollers is used to smooththe surface of the material.
   这对滚轮用于平滑材料的表面。
2. 2. The engineer designed apair of rollers to increase the efficiencyof the machine.
   工程师设计了一对滚轮来提高机器的效率。
3. 3. Thepair of rollers wasused to remove the dirt fromthe road.
   这对滚轮被用来从路上清除污垢。