gastrulation的音标？

This pushing - in of cells marks the start of gastrulation.细胞的这种向里推进标志着原肠胚形成的开始.The outer layer of a blastula that gives rise to the ectoderm after gastrulation.外胚层囊胚的外层,在原肠胚形成之后生后外胚层组织....

n.原肠胚形成...