Prior to lowering the top drive system or rigging down, ensure that sufficient wraps of drilling line remain on the drum.

在下放或拆卸顶驱系统之前，要保证辊筒上留有足够的大绳圈数。

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In view of this, author launched the design and research in a full-hydraulic top drive drilling system.

鉴于此，笔者开展了全液压顶部驱动钻井系统的设计与研究。

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The top drive drilling system, divided into electrical top drive and hydraulic top drive.

顶部驱动钻井装置，分为电驱动顶驱和液压驱动顶驱。

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Driven by rising multimedia use, present PC configurations are seeing greater memory and hard drive capabilities, on top of which a new operating system could drive PC unit gains toward the 20% year to year level in each of the next two years.

FORBES: Intelligent Investing

Why not push digital music and video stored on a PC or set-top box with a hard drive to any TV or stereo system in the house?

FORBES: Home Networking's New Push