天然气生产者已经通过水平钻孔技术和水力破碎技术的结合从页岩结构中开采天然气，从而来增加天然气供应和可恢复储备。
Producers have boosted supplies and recoverable reserves in the United States by combining horizontal drilling with hydraulic fracturing, also called fracking, to produce gas from shale formations.
结合电牵引采煤机破碎机构行星齿轮传动原理，应用数学规划理论进行机械优化设计。
Couple transmission principle of electric haulage shearer breaking mechanism planet_gear use maths program theory for optimization of mechanical design.
本文结合实际工程，介绍了静力破碎技术的原理和应用。
This thesis introduces the fundamentals and application of the technology to static crush in the light of a certain actual project.
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