Most drilling in metal is done with a twist drill.
大多数金属钻孔用的是麻花钻头。
Finally, the optimization of the most secure directional drilling program.
最后，优选安全性最高的定向钻穿越方案。
The effect of the feedrate to drilling force is the most significant.
进给速度对钻削力的影响最为明显。
He is the most able engineer of the second drilling company.
他是钻排二公司最有能力的工程师。
In this area drilling, the most important problem is preventing blowout.
在这个地区打井，最重要的问题是防喷。
In this area drilling, the most important problem is preventing blowout.
在这个地区打井，最重要的问题是防喷。
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