1. The egg case of certain insects and mollusks. 
   卵囊一些昆虫或软体动物的卵囊
2. A similar natural protective covering or structure, such as the egg case of a spider. 
   茧状物类似的自然保护覆盖层或结构，例如蜘蛛的蛋壳
3. The emergence of an adult insect from a pupal case or an insect larva from an egg. 
   孵化成虫从蛹中孵出来，或幼虫从卵中孵化出来
4. egg and egg product 
   蛋和蛋制品
5. egg and embryo transfer 
   卵和胚胎的移植

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• 1. 卵鞘
  卵囊 egg case...卵鞘 egg cell...卵细胞 egg cells
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• 2. 鸡蛋盒
  51 天...egg case（鸡蛋盒）...51 天
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