Cobalt

The merit of funnel drilling machine and its practical example;

钻斗钻机的优点及其工程实践实例

unit-type drill head

组合钻床钻头, 标准钻头

To bore(a shaft) with a trepan.

钻用钻井机钻（矿井）

offshore drilling

海底钻探;海上钻井;海上钻探;海洋钻井;海洋钻探;近海钻探;滨外钻探

high-thrust drill

强力钻机，高推力钻机

kelly for well-drilling machiens

旋转钻孔,钻井机用

tap(ping) drill

螺丝孔钻，螺丝底孔钻

combination center drill

组合中心钻，复合中心钻

churn-type percussion drill

无游梁绳式顿钻钻机

easing the bit in

钻头轻压慢转钻进地层

mixed oil drilling rig

复合式石油钻井钻机

deepwater drilling

深水钻进、深海钻进

auger with valve

(钻浅井用) 带阀螺旋钻具

The sorker was drilling.

此工人在用钻孔机钻孔。

A tool used for drilling.

钻头用于钻孔的工具

This drill can bore through rock.

这台钻机能钻透岩石.

a bit used in drilling for oil.

油田钻井使用的钻头。

An oil platform.

钻井平台石油钻井平台

Diamond drilling replaced percussion drilling.

金钻探取代了冲击钻探。