Most drilling in metal is done with a twist drill.

大多数金属钻孔用的是麻花钻头。

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Cordless drill: a 12-volt model will handle most drilling tasks.

无绳钻头：一个12伏型号的将会处理大部分钻井任务。

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Differential sticking is, for most drilling organizations, the greatest drilling problem worldwide in terms of time and financial cost.

对大部分钻井组织而言，就时间和费用而论，压差卡钻是发生最多的事故。

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The White House says it is preparing for the worst. Experts say the most effective solution involves drilling relief wells to reroute oil, a process that could take months.

VOA: standard.2010.05.31

At the bottom of the Knotty Head hole, the 450-degree-Fahrenheit temperature and the pressure (2, 000 times atmospheric) would crush or melt most drilling tools.

FORBES: Magazine Article

But Democratic leaders have opposed efforts to repeal a 1981 law barring most offshore drilling.

CNN: Lawmakers seek oil-drilling compromise

Democratic leaders had previously opposed Republican-led efforts to repeal a 1981 law barring most offshore drilling.

CNN: House OKs bill allowing more offshore oil drilling