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为什么火车会发出噪音呢？

火车发出噪音是因为火车在行驶过程中与铁轨产生摩擦和震动。当火车经过铁轨时，车轮与轨道摩擦会产生摩擦声。此外，火车的引擎、车轮与轨道的接触也会产生震动和振动，进而传导到周围空气中，形成噪音。

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