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小布什政府的强硬政策破坏了美国与欧洲盟友之间的关系，并导致美国的国际声望直线下跌。

The hard-line foreign policy of the Bush Administration undermines the relationship between the United States and its European allies, leading to a sharp decline of the US's reputation in the world.

or

The Bush's hard-line foreign policy undermines the relationship between the United States and its European allies, leading to a precipitous fall of the US's international reputation.