A hydraulic variable speed drive system of shield disk cutter has been designed.

设计了盾构刀盘变转速液压驱动系统。

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A hydraulic drive system of cutter head in shield tunneling machine was designed, which is open type hydraulic system and controlled in open-ring.

设计了一个盾构掘进机的刀盘驱动液压系统，该系统是开式液压系统，应用电液比例控制技术实现了泵排量实时调节。

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A small man with a big shield will drive the archers mad.

一个小个子躲在一个大盾牌后面会让任何一个弓箭手疯掉的。

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And in making the announcement, President Obama said once again the American drive for a missile shield has never had anything to do with Russia.

VOA: standard.2009.09.17

There are certain things I want to shield her from until she's old enough to understand the social dynamics and social implications that drive this.

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