将一块带有尖刃的石器和一根强壮的树枝接在一起，利用这根长矛人类可以极大地提高速度、力度、效率和安全性。
Attach a sharp stone to the end of astout piece of wood, and with this lever you can hugely increase thespeed, force, effectiveness and safety with which the axe can bewielded.
剪刃位置控制是高速线材生产中所使用的启停式飞剪的关键控制环节，其控制精度的高低直接影响到飞剪的正常工作。
It's very important that accurate position of the edge of start stop shear to high speed wire mill production. Shear would run by accurate controlled.
刀具破损的主要形式为高速钢刀具切削刃塑性变形和陶瓷刀具的崩刃。
The modes of tool damage include plastic deformation on cutting edge of high-speed steel tool and tipping of ceramics tool.
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