The Great Recession and its surge of long-term unemployment are a severe test of what was once seen as a distinctive US economic strength.

大萧条以及美国长期失业率飙升，是对曾被视为美国经济独特优势的严峻考验。

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Based on it, the formulae of contact strength of mesh points between the movable teeth and the surge wheel, the movable teeth and the internal gear are derived.

在此基础上导出了活齿与激波器、活齿与内齿轮啮合处的接触强度的公式；

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A weak pound could also explain Britain's renewed economic strength, much as a surge in the yen has increased worries about Japan.

英镑的弱势也解释了英国得以复原的经济活力，这跟日元飞涨让日本忧心忡忡是一个道理。

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If he needed a surge of strength, he imagined throwing an electric switch to flood his muscles with power.

ECONOMIST: John Bachar, free-climber, died on July 5th, aged 52

He said troop strength could be brought to pre-surge levels by next summer.

NPR: Petraeus, Crocker Brief Congress on 'Surge'

Eight months ago, we adopted a new strategy to meet that objective, including a surge in U.S. forces that reached full strength in June.

CNN: Text of President Bush's speech