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夏日的风可以带来凉意,冬日的风可以吹起漫天的雪花,此外,风还有什么作用呢?For centuries, farmers have used windmills to pump water, crush grain and perform other tasks. Today, farmers can earn money with high-powered wind turbines that produce electricity. Wind power has become big business, especially in Europe.
In the United States, less than one percent of electricity… |
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