Mechanical rock breaking is the main function of modern rotary drilling. The purpose of jet aided mechanical rock breaking is to improve the penetration rate.
现代旋转钻井破碎岩石是以机械破岩为主导方式，射流辅助机械破岩的目的是提高机械钻速。
Penetration of fluorine polymer can be used to improve the mechanical strength, stop or slowdown the attack of water to ancient relics for protection of ancient brick-based buildings.
用含氟聚合物渗透加固保护古代砖质类建筑，提高文物的机械强度、抑制或减缓水对文物的侵蚀。
The efficiency of the extraction depends on the penetration power and the solvation properties of the solvent, the duration of the extraction, and whether mechanical disruption is used.
色素提取的效率决定于溶剂的渗透力和溶解能力，而不能单单依赖机械破碎。
The drill bit is a direct tool for rock breakage. The rate of penetration is closely related with the drill bit as well as the mechanical properties of the rocks.
钻头是直接破碎井底岩石的工具，钻井速度的快慢不仅与钻头有关，而且与所钻岩石的力学性质密切相关。
A soil engineering classification derived from the piezocone penetration test(CPTU) involves the uncertainty of correlation between soil composition and soil mechanical behavior.
采用孔压静力触探（CPTU）测试资料进行土的工程分类时，在土成分和力学性状等相关性方面会产生很多不确定性。
Porosity is apt to occur in deep penetration laser beam welding, which has severe influence on the mechanical properties of laser welded joint.
针对激光深熔焊过程中易出现的气孔问题，作者提出光束摆动激光焊接减小气孔倾向的工艺。
Exact Prediction and calculation of mechanical property and drillability of rock can provide the necessary base for the optimization of bits and designing parameters, thereby quickening penetration.
准确预测和计算岩石的力学性质和可钻性是有针对性地优选钻头、优化设计参数，从而提高钻井速度的重要依据。
However full penetration welds, to restore the mechanical resistance of the parts connected and if not specifically indicated on the drawings, to be performed in continuous.
然而用来修复相连部件的机械阻力的全溶焊接，如在图纸上无特别说明，则可继续执行操作。
Research on penetration model of rock is one of the most important subjects in coupled hydro-mechanical research.
渗流模型是岩石流固耦合研究的一个关键问题。
Research on penetration model of rock is one of the most important subjects in coupled hydro-mechanical research.
渗流模型是岩石流固耦合研究的一个关键问题。
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