they use windmills
他们使用风车
以上为机器翻译结果，长、整句建议使用 人工翻译 。
They are sure that they have found the answer to the problem. They use windmills.
他们确信他们已经找到了解决问题的办法：他们使用风车。
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Apart from water power, people found they could make use of the force of the wind to create power and windmills were built.
除了水之外，人们发现风车还能利用风的力量，最后制造了风车。
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