double-walled stage of the embryo resulting from invagination of the blastula; the outer layer of cells is the ectoderm and the inner layer differentiates into the mesoderm and endoderm
双语例句
1. However , content of the dissolvable protein and amino acid during gastrula stage during blastula stage.
总氨基酸含量在胚胎发育早期下降较快, 胚胎发育至后无节幼体期氨基酸含量下降幅度变缓.
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用作名词 (n.)
The resulting gastrula consists of an outer ectoderm, an inner endoderm, and a mesoderm layer positioned between them. 最终原肠胚由一个外肠胚，内肠胚，和一个中肠胚构成。
