名词
中文翻译：美国
同义词：
['United States', 'America', 'United States of America']
例句：
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1. The US is the third-largest economy in the world.
美国是世界上第三大经济体。
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2. He has lived in the US for over 30 years.
他已经在美国生活了30多年。
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3.The US government is responsible for enforcing immigration laws.
美国政府负责执行移民法律。