In rock drilling process with percussion-rotary drill rotating drilling tool bears two toques: dynamic torque which drives drilling tool into rock mass, and resistance torque of rock mass.

前言：在冲击—回转式凿岩机向岩石钻进过程中，旋转中的钻具承受着两种力矩的作用：一是驱动其旋转的动力矩；二是被钻岩石阻止其旋转的阻力矩。

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Social media users criticised the challenge, labelling it 'completely unsafe', however most seemed to be concerned the rotating drill would damage the competitive eater's teeth, not tear out his hair.

社交媒体的用户们对这项挑战持批评态度，他们认为这“完全不安全”，但是大多数人似乎是担心旋转的电钻会损伤挑战者的牙齿，而不是扯下他们的头发。

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Drilling is performed with a rotating tool called a drill.

钻孔是用一个称为“钻头”的旋转刀具进行的。

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Over the next five years, the team will use a long, hollow, rotating drill to cut and retrieve a cylinder of ice roughly 12 centimetres across.

ECONOMIST: The South Pole as location and metaphor