This paper introduces gear wheel drill speed system which composed of Siemens PLC and Siemens inverter.

介绍了由西门子P LC和变频器组成的牙轮钻机的调速系统。

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The drill has variable speed control.

这钻机有变速控制。

《牛津词典》

Means are provided for varying the spindle speed and (on some machines) for automatically feeding the drill into the workpiece.

另有各种装备可改变转轴速度及使钻头自动钻入工作件中。

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In the months ahead, scientists expect to probe beneath the planet's surface crust for evidence of chemistry favorable to microbial life, using the robot rover's unique high-speed drill.

WSJ: NASA's Curiosity Rover Lands on Mars

Capiapo, Chile (CNN) -- A new drill in Chile that could speed the rescue of trapped miners arrived at the rescue scene on Friday with great jubilation from families of the workers.

CNN: New drill arrives in Chile with great fanfare