gas·tru·la·tion /ˌgæstrəˈleʃən/
  原腸胚形成
  gas·tru·la·tion /ˌgæstrəˈleʃən/ 名詞
  原腸(胚)形成
  Gas·tru·la·tion n. Biol. The process of invagination, in embryonic development, by which a gastrula is formed.
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  gastrulation
       n : the process in which a gastrula develops from a blastula by
           the inward migration of cells