• 1. 两侧对称祖先
  两侧对称||bisymmetry...两侧对称祖先||dipleurula ancestor...两囊幼虫||amphiblastula
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1. A forefather; an ancestor. 
   祖宗；远祖
2. An ancestor; a forebear. 
   祖先；祖辈
3. A male ancestor; a forefather. 
   男性祖先；祖辈
4. An ancestor or a forefather. 
   祖宗或祖先
5. people descended from a common ancestor. 
   由共同的祖先繁衍而来的人。

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