whetstone
n. 磨石
近义词：abrasive，grindstone，hone，steel，stone，grinder，sharpener，
英英释义
Noun
- a flat stone for sharpening edged tools or knives
例句
用作名词(n.)
- Competition is the whetstone of talent.竞争磨炼才能。
- The finest edge is made with the blunt whetstone.最锐利的锋刃是从粗糙的磨刀石上磨出来的。