In theory, this could one day provide a key component of any nanoscale electrical circuit-a way to mechanically turn the current on and off or change its direction.

理论上讲，这种机械切换电流通断或方向的方法，或许有一天会成为任何纳米尺度电路的关键元件。

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The key to the solution is the option of high availability configurations based on Power virtualization, which allows applications to automatically be moved off of a failing machine to a backup.

这种解决方案的关键是选择了基于电源虚拟化的高可用性配置，它允许应用程序自动从故障机转移到备份机。

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One of the key aspects of the system architect's role is to weigh up conflicting requirements and decide on a solution, often by trading off one aspect against another.

系统架构师角色关键的一方面就是衡量相互冲突的需求、决定解决方案，常常要牺牲一个方面来换取另一个方面。

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Another source of concern: the discovery of 20 tar balls off Key West,Florida on Monday.

VOA: standard.2010.05.18

Despite his fondness for sounding off on key issues of the day, Llamas followed his attorney's advice and refused to talk to reporters after his court appearance.

CNN: Man arrested for disrupting Senate trial pleads not guilty

You know, just learn to turn the key on and off, maybe a little bit more, not run the tractors quite as hard.

NPR: The Toll of High Gas Prices: Two Stories

With a mechanical keyboard, on the other hand, each key press triggers an actual on-off switch a feeling as solid as flicking on the lights.

WSJ: Keys That Really Click