名词
中文翻译：美国
同义词：
['United States', 'United States of America']
例句：
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1. The United States is a country with a rich history and culture.
美国是一个有着丰富历史和文化的国家。
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2. The United States has a population of over 330 million people.
美国的人口超过3亿3千万。
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3. The United States is known for its innovations in technology and science.
美国以其在技术和科学上的创新而闻名。