The pulsed water cannon which is a new and effective hydrodynamic rock-breaking device, will find a wide application.

脉冲水炮是一种新型有效的水力破岩装置，因而具有广阔的发展前景。

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The bit needs not only the high rock-breaking capacity but also the strong wear and low resistance during rock-breaking process.

而钻头在破岩过程中，既要求具有高效的破岩能力，又要求具有强耐磨性和低阻力。

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The main factors that influence the efficiency of rock-breaking are the down-hole rock properties and the rock-breaking tools and methods.

其破岩效率的主要影响因素是井下地层岩石性质、破岩工具和方法。

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