The BHA transmits its torsional vibration to the gear system of drill power pack and brings about nonlinear vibration.

钻柱将其扭转振动传至钻机动力头，引起动力头齿轮传动系统的非线性振动。

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Stacked near the checkout counters, and as colorful as a Fisher-Price toy, it is a not-so-serious-looking power tool: a battery-operated saw-and-drill combination.

堆在收银台附近，像费雪玩具一样颜色鲜艳的它，是一个看起来不那么严肃的电动工具：一个电池驱动的锯和钻的组合。

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Because the beam was powerful enough to drill holes in razor blades, physicists measured its power in gillettes, or the number of blades penetrated.

由于激光光束的能量强大到足以在刀片上钻洞，物理学家使用穿透刀片的数量作为激光能量的计量单位。

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This resembled a power drill, with an attachment made of bearings and springs.

FORBES: Global Life

Most homeowners can get by with a 14.4-volt power drill.

FORBES: Merchant Princes

We also checked out a new ultracapacitor that can charge a power drill in 60 seconds, and researchers are working on energy-generating fabrics that can transform your t-shirt into a power plant.

ENGADGET: Inhabitat's Week in Green: sexy green cars, glass strong as steel, and Tianjin's Eco-City revealed