“刀峰和石头撞击时”。大师说。
"The time blade dashing against the stone." replied the master.
由于撞击夹刀块的能量包括爆炸气压和冲块的动能两项，所以夹刀块能获到很大的初始加速度。
Since the energy which strikes the tool holder includes the explosive gas pressure and the kinetic energy of the moving plunger, thus a high initial acceleration of the tool holder is obtained.
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