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。

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The rate of penetration of the negative pulse jet assisted drilling can increase from 0.7 to 3.0 in in-house simulation drilling compared to conventional drilling.

与常规钻井相比，室内模拟钻井试验条件下负压脉冲射流辅助钻井可以使钻速提高0.7-3.0倍。

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According to figures from the first half of 2010 and published on Internet World Stats the rate of penetration of the Internet on the entire global population does not exceed 29%.

据《互联网世界统计》发布的2010年上半年的数字，能够渗透互联网的全球人口比率不会超过29%。

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"The Internet penetration rate of those three places is fairly low.

VOA: special.2011.02.07

Australia is countenancing the same sorts of issues, as it will soon have the highest rate of rooftop solar penetration on the planet.

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As mobile network operators gradually migrate of to CDMA from GSM in emerging markets, we expect the rate of CDMA penetration to increase, however at a slower pace, due to a larger mobile phone base.

FORBES: Qualcomm Gets To $48, Higher If CDMA Expansion Has Legs

Although efficiency may explain a recent leveling of this trend, the penetration rate of building solutions has been insufficient to offset the sheer energy demand, highlighting a gap between actual and theoretical impact.

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