经济合作与发展组织最新的经济展望估计美国的产出缺口，即实际GDP和潜在GDP的产值，几乎达到了百分之五，而英国则超过了百分之六，二者都比日本更大。

The OECD’s latest Economic Outlook estimates America’s output gap, the difference between actual and potential GDP, at almost 5% and Britain’s at over 6%, both larger than Japan’s.

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论述了燃料电池的原理，详细分析了燃料电池的特点和类型，并对其发展前景作了展望。

This paper expounded the principle, develop, characteristics and types of fuel cell in an introductory mood and pictured its prospect.

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总结了本研究的主要成果和不足之处，展望了流动人口研究的趋势和发展前景。

It sums up achievements and limitations in this paper, prospects tendency of floating population research.

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