20世纪后，石油代替煤炭成为廉价燃料的选择。

In the 20th century oil replaced coal as the cheap fuel of choice.

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故事选择在18世纪殖民时期的美国的一个侧面。

Choose a side story in the 18th century colonial America.

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通过这种选择性，可了解北京的21世纪全球战略。

Through the selective, can understand Beijing's global strategy for the 21st century.

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通过这种选择性，可了解北京的21世纪全球战略。

Through the selective, can understand Beijing's global strategy for the 21st century.

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