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人为什么会感到疼痛？

人会感到疼痛是因为我们的身体具有神经系统，其中包含了传递疼痛信号的神经纤维。当我们身体受到伤害或受到某种刺激时，这些神经纤维会向大脑发送疼痛信号。大脑接收到这些信号后，会对疼痛作出反应，让我们有意识地感受到疼痛。疼痛是身体的一种保护机制，它提醒我们避免伤害或对受伤部位进行保护。

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