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我的推测是：这个原因是与豌豆的雌蕊形成有关。豌豆的雌蕊是由一个叫作心皮的变态叶内卷(ye nei juan)形成的。胚珠(pei zhu)就长在心皮的边缘，心皮不断内卷最终闭合形成边缘胎座。当雌蕊传粉(chuan fen)受精后，子房(zi fang)...