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为什么风车会转起来呢？

风车转起来是因为风的力量。当风吹到风车的扇叶上，扇叶会受到风压并产生转动的力量。这是由于风的运动所引起的空气压力差，使得风车的扇叶被推动并旋转。风力越强，转动的速度也会越快。

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