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为什么水会往下流？

水往下流是由于地球引力的作用。地球的引力使得物体朝向地球的中心聚集，而水属于流体，在受到重力的影响下，会沿着最低处的路径向下流动。此外，水分子之间的相互作用力也会推动水向下流动，这是由于水分子内部的氢键形成引起的。氢键是一种弱的相互作用力，但在水分子的规模级别上，这种力是强大的，足以推动水分子流动。

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