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风动汽车;美国科技人员设计出一种用风力推动的汽车。车的外形与普通汽车一样,只是在车顶上装了一部风车。这种风车不受风向的限制,而且只需很小的风力便可
Wind-driven cars; U.S. scientists design a wind-powered car. The shape of the car and ordinary cars, just installed in the roof of a windmill. This windmill is not subject to the wind direction, but only a very small wind can be