scuff mark

• 擦伤

scuff mark的用法和样例：

例句

1. Also, the valves close with a great deal of impact, which may crack or break the valves and scuff the camshaft and followers.
   此外，气门关闭撞击力大，可能撞裂或撞碎气门，并擦伤偏心轮轴和随动机构。