Definition
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capital
The capital is the city where a country's government is based.
首都是一个国家政府所在地的城市。
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Beijing is the capital of China.
北京是中国的首都。
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Washington, D.C. is the capital of the United States.
华盛顿特区是美国的首都。
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Tokyo is the capital city of Japan.
东京是日本的首都。