The analysis shows that the power relation between the interlocutors is an essential contextual factor that constrains the speaker' s options of response strategies.

分析表明，会话双方的权势关系是制约说话者选择冲突性话语回应策略的重要语境因素；

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But Nye tells VOA that while the power of U.S.ideas and its ability "to deter Soviet aggression" are essential to understanding the end of the Cold War, neither are root causes.

VOA: standard.2009.11.03

When a disaster like Hurricane Sandy knocks out the lights, it's essential to have a source of off-grid power for communication devices like cell phones and radios -- to this end we showcased several portable charging technologies that generate renewable energy.

ENGADGET: Inhabitat's Week in Green: self-sustaining homes, wooden wind turbines and the world's first solar-powered nation

The UN nuclear watchdog has called on the operators of Japan's Fukushima plant to improve "essential systems" amid continued leaks and power cuts.

BBC: IAEA calls for improvements at Japan's Fukushima plant

With its latest device, LeapFrog's continuing to fight the good fight: teaching kids essential skills through the power of consumer electronics.

ENGADGET