n.

1. 摩擦；摩擦力[U]
   Friction causes a rolling ball to stop finally.

   摩擦力使得一只滚动的球最终停了下来。

   Constant friction wore out the heels of my shoes.

   不断的摩擦磨损了我的鞋跟。

2. 不和，争执[U][C]
   political friction between two countries

   两国间政治上的不和

n.

1. the resistance that one surface or object encounters when moving over another.
   ▸the action of one surface or object rubbing against another.
2. conflict or disagreement.