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为什么家禽会产下未受精的蛋？这对他们来说是不是本身能量的损耗，利人不利己？是出于什么样的生物学原理？ 知乎 Template






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sketch 3344 Homer by Samuel Roberto
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tomski为什么家禽会产下未受精的蛋？这对他们来说是不是本身能量的损耗，利人不利己？是出于什么样的生物学原理？ 知乎 coloring
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