Through the analysing of mechanism of breaking rock in a hole explosion, the principle and design method of a crushing blasting is expounded.
通过对炮孔爆破的破岩机理分析，论述了挤压爆破的原理；
The breaking and milling tool is a special tool used which is used to cut and mill a section of casing in hole so that sidetrack drilling operation can be done smoothly.
断铣工具是用来割断并磨铣井内一段套管以能够进行侧钻作业的专用工具。
Now and again a hole gave the first sledge a jolt; the next was jolted in just the same way, and the next, and the sledges followed one another, rudely breaking the iron-bound stillness.
前面的雪橇在行驶时碰到了一个坑洼，颠簸了一两下，后面的几辆雪橇也同样地碰到了坑洼，这几辆雪橇莽莽撞撞地打破禁锢着的寂静，开始拉开距离向前驶去。
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