rubefaction

例句：

1. 1. The frictionbetween the two surfaces caused the wheel toslow down.
   两个表面之间的摩擦导致轮子减速。
2. 2. The rubbing effect of thesandpaper on the surface was noticeable.
   砂纸对表面的摩擦效果很明显。
3. 3. The frictionbetween the two objects is what causes themto move or change position.
   两个物体之间的摩擦是它们移动或改变位置的原因。