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。
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。
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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