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为什么一颗苹果会从树上掉下来？

当苹果成熟后，果皮上的脱落层会松动，与果实本身产生分离。同时，果实内部的细胞开始分解果胶和纤维素，导致果实变软。这两个因素结合在一起，使得苹果失去了紧密连接树枝的能力，最终导致苹果从树上掉下来。

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