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Ever since then, all descendant vertebrates have had the forward end of the digestive system and the forward end of the respiratory system very much involved with each other. This manifests itself in the human body with a crossing of the two systems in the throat.
从那时起，所有的脊椎动物后代都有消化系统的前端和呼吸系统的前端彼此紧密相连。这表现在人的身体与两个系统的交叉在喉咙。