friction

Sara sensed that there had been friction between her children.

萨拉感觉到她的孩子们中间出现了摩擦。

If, however, there's so much friction at home that it interferes with your academic work, you might want to consider sharing an apartment with one or more friends.

然而，如果家里有太多摩擦，干扰了你的学业，你可能得考虑和一个或多个朋友合租一套公寓。

The pistons are graphite-coated to reduce friction.

活塞表面涂有石墨以减少摩擦。

The force of friction slows the spacecraft down as it re-enters the earth's atmosphere.

航天飞机重返地球大气层时因有摩擦力而减慢速度。