单词：tool edge
tool edge的用法和样例：
例句
- A single-point tool has only one cutting edge, while a multiple-point tool has two or more cutting edges.单刃刀具只有一个切削刃，而多刃刀具有两个或两个以上的切削刃。
- He sharpened the edge of his knife on a grindstone.他在磨石上磨快了他的刀刃。
- Pity lack of a section on edge,but it shows its rigid blade.遗憾的是刀锋上缺了一小块，不过可以显示出刀刃够硬的。
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