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.
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.
穿越动作、提早用刃以及在滚落线处提早释放压力相结合，可以在大小回转中提高速度。
Combination of a cross movement, early edge set and pressure in the fall-line with early release are used to produce acceleration in Slalom and GS turns.
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