乳头;
The results indicated that the eggshell structures of four birds were much similar with other bird species, which were outer layer, spongy layer, cone layer, mammilla, shell membrane layer and pore channels through the shell from outer to inner.
结果显示,这四种鸟类的卵壳结构与其他鸟类的基本相似,由外而内依次为表层、海绵层、锥体层、乳突、壳膜层及贯穿卵壳的气孔道等。
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