America’s greater dependence on its rich is due in part to their good fortune.
美国之所以如此依赖它的富人群体，一部分原因是他们拥有好运气。
Yet improvements in energy efficiency mean dependence on oil is not what it once was.
由于能源效率的提高，目前对石油的依赖性没有以前大了。
Yet improvements in energy efficiency mean dependence on oil is not what it once was.
由于能源效率的提高，目前对石油的依赖性没有以前大了。
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