pad roller

• 衬垫滚珠

pad roller的用法和样例：

例句

1. It is to reduce friction that roller bearings are used.
   正是为了减少摩擦，才使用滚珠轴承。
2. Roller or ball bearings have gradually edged out the earlier types of bearings in which the surfaces in contact move by sliding.
   滚柱或滚珠轴承已逐渐代替那种接触表面靠滑动运动的早期型号的轴承。