The cutting tool material is best used hard alloy.
刀具材料最好采用硬质合金。
The cutting tool must be harder than the material to be cut.
切削刀具必须比要切削的材料硬。
Strength in cutting-tool material is not always proportional to hardness.
刀具材料的强度并不都是与硬度成正比的。
Strength in cutting-tool material is not always proportional to hardness.
刀具材料的强度并不都是与硬度成正比的。
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