Whereas the Bush document started by stressing America's "unprecedented and unequalled" strength and influence, Mr Obama's acknowledges the limits to America's power.

布什的战略文件一开始便强调美国“前所未有，举世无双”的国力和世界影响力，而奥巴马却承认了美国国力的局限性。

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In this case, the Position Limits Rule, which according to both parties is a significant and unprecedented change in the operation of the commodity derivatives market, has not yet gone into effect.

FORBES: Dramatic Federal Court Ruling Vacates CFTC Positions Limit Rule

The FDA had been poised to allow over-the-counter sales with no age limits when Sebelius took the unprecedented step of overruling the agency.

WSJ: Obama faces choice on morning-after pill limits