The proof is based on an energy inequality and the density of the range of the operator generated by the studied problem.

本文研究高阶复合方程基于能量不等式和生成算子的稠密性。

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Russia's economy would fall off a cliff if energy prices slumped and its population, racked by ill-health and inequality, is shrinking by up to 800, 000 a year.

如果能源价格暴跌，那么俄罗斯经济将陷入深渊；同时人口数量受到健康状况和贫富差距的双重打击，每年最多减少80万人。

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Average wages have stagnated since 2001 because of high energy prices, rising health-care costs and widening inequality.

因为能源价格居高不下，医疗保健成本上涨，不平等现象加剧等原因，平均工资从2001年起就止步不前。

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Summers suggested the nation faces four major problem areas: energy, health care, inequality of income and continued strength of our financial system.

FORBES: Regulate All That Leverage

Russia's economy would fall off a cliff if energy prices slumped and its population, racked by ill-health and inequality, is shrinking by up to 800, 000 a year.

ECONOMIST: NATO and the invasion of Georgia

Still professing optimism, he said three huge problems could yet cloud our future: growing income inequality, too much political and economic instability, and an unsustainable energy regime.

FORBES: Bill Clinton Enlivens Dell Conference