钝磨石 dull stone
金刚石刀具钝圆半径 Blunt radius of Diamond Tool
钝石
Blunt stone
以上为机器翻译结果，长、整句建议使用 人工翻译 。
刀钝石上磨，人蠢没奈何。
A blunt knife may be sharpened on a stone, but if a man is stupid there is no help for his stupidity.
youdao
如果你试以刀砍石，你就会把刀刃弄钝。
If you try to cut stone with a knife, you will blunt the edge.
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