flat end needle rollers

例句：

1. 1. Theflat end needle rollers are used tosmooth the surface of the material being processed.
   平头针辊用于平滑正在处理的材料的表面。
2. 2. The flat end needle rollers areessential for the quality of the final product.
   平头针辊对于最终产品的质量至关重要。
3. 3.The flat end needle rollers are usedin various industries, such as manufacturing andconstruction.
   平头针辊在制造业和建筑业等各种行业中都有应用。