常見(jiàn)例句用作名詞 (n.)The resulting gastrula consists of an outer ectoderm, an inner endoderm, and a mesoderm layer positioned between them.最終原腸胚由一個(gè)外腸胚，內(nèi)腸胚，和一個(gè)中腸胚搆成。 返回 gastrulas