The surface drive unit of screw pumps features in complex stress and many vibration sources, so the traditional vibration test method cannot determine the diagnosis accurately.

螺杆泵地面驱动装置受力复杂，振源众多，常规的振动测试对于故障的定位与诊断精确度不高。

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Further alterations were later made, including changes to the mill's second waterwheel to drive a surface water pump and haul trucks from a neighbouring gypsum mine.

BBC: Cumbria's Acorn Bank Mill grinds first flour for 70 years

It's got 8 speakers, a subwoofer, a removable keyboard, slot-load DVD drive, a "leather-like" surface.

ENGADGET: Live coverage of Michael Dell

Oceaneering leases the machines to oil companies, including BP, but sends its own crew to drive the complicated robots from boats on the surface of the water.

CNN: John D. Sutter