In the worlds largest economy, that of the United States of America, 80% of productivity growth is attributed to technological and knowledge-based advances.

就以美国这个全球最大的经济体系为例，全国百分之八十的生产力增长，都源自先进科技和知识有关的业务活动。

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What the President has been saying for quite some time now is that he believes that comprehensive immigration reform is in the best interests of the economy of the United States of America.

WHITEHOUSE: Press Briefing by Deputy Press Secretary Josh Earnest

There is little dispute, that in 2011, even with the rise of the E7 nations the most important economy and hence stock market is still that of the United States of America.

FORBES: Innovation In Investment Vehicles

And in terms of the debt ceiling, we also believe, as members and leaders of Congress of both parties have said, that it has to be raised because the effect of defaulting on our obligations as the United States of America would be calamitous to the domestic economy and to the global economy.

WHITEHOUSE: Press Briefing