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风车,顾名思义,必须在有风时才能转,大家自制的小风车也一样。但有一种风车不要风,也能转得很欢。它就是我们下面要介绍的热气风车。
Windmill, as its name implies, must be turned when there is windy weather. But there is a windmills do not wind, but also can turn very happy. It is the hot-air windmill we will introduce below.