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1·Two, can not directly observe the cutting tool.

不能直接观察到刀具的切削情况。

2·The cutting tool material is best used hard alloy.

刀具材料最好采用硬质合金。

3·The wear and rupture of cutting tool are investigated.

分析了切削硬岩时的刀具磨损和破损特征。

4·Danny: By moving a cutting tool against a rotating workpiece.

丹尼：通过将切割刀具移近旋转的工件。

5·Jigs physically limit and control the path of the cutting tool.

钻模有形地限制和控制钻削刀具的路径。

6·It also introduces the machined surface quality using PCBN cutting tool.

同时也介绍了PCBN刀具的加工表面质量。

7·BORE: The process of enlarging an existing hole with a rotating cutting tool.

镗孔：使用旋转式切削工具扩大孔的过程。

8·Nonmetallic body of cutting tool, cutting tool and its mfg. and using method.

切削工具的非金属本体，切削工具及其制造，使用方法。

9·Acoustic emission (AE) is a new method for cutting tool condition monitoring.

声发射是一种新的切削刀具状态的监测方法。

10·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。