abrasion

名词 abrasion:

1. an abraded area where the skin is torn or worn off
   同义词：scratch, scrape, excoriation
2. erosion by friction
   同义词：attrition, corrasion, detrition
3. the wearing down of rock particles by friction due to water or wind or ice
   同义词：grinding, attrition, detrition

1. A hole or worn spot made by abrasion or erosion.
   侵蚀处由于侵蚀或磨擦形成的洞或破处
2. Poorly crystallized diamonds used for industrial cutting and abrasion.
   结晶差的金刚石用作工业切割和研磨。
3. A minor scratch or abrasion.
   擦伤一个轻微的擦伤或磨损
4. An implement with cutting edges or a pointed end for boring holes in hard materials, usually by a rotating abrasion or repeated blows; a bit.
   钻带切割刃或尖端的工具，用于在坚硬材料上钻孔，一般靠旋转磨损或反复击打实现钻孔