The cutting tool may have a single cutting edge or may have many cutting edges.
刀具可能只有一个刀刃或者可能有多个刀刃。
The sharp part of a tool, such as the cutting edge of a knife or ax.
刀刃，斧刃工具的锋利部分，如刀片或斧头切割边。
It is generally used in a machining process called "hard machining", which involves running the tool or the part fast enough to melt it before it touches the edge, softening it considerably.
它一般是在加工过程中使用一个被称为“硬加工”，其中包括运行的工具或零件之前溶化速度不够快，倒是它的边缘，它大大软化。
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