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为什么火车在铁轨上行驶？

火车之所以能够在铁轨上行驶，是因为铁轨有一定的强度和稳定性，能够承受火车的重量和运动力。同时，火车的轮轴和车轮与铁轨的轮道之间形成了紧密的接触面，通过摩擦力和重力，火车可以牢固地沿着铁轨行驶。

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