摩擦计

例句：

1. 1. The car's tires are worndown from the constant friction with the road.
   汽车的轮胎因为与道路的持续摩擦而磨损。
2. 2. The friction between the twopieces of metal is causing them to slideagainst each other.
   两块金属之间的摩擦导致它们相互滑动。
3. 3. The friction between the twosurfaces causes heat to be generated.
   两个表面之间的摩擦产生热量。