germ layer formation的用法和樣例：
例句
- Many signaling pathways play important roles in the formation of mesoderm and patterning of the neuroectoderm during early development of vertebrate embryos.
在脊椎動(dòng)物胚胎的早期發(fā)育中，多種信號途徑對中胚層形成和神經(jīng)外胚層分化起著(zhù)重要的調節作用。 - The mucosa layer had primary longitudinal folds,which derived of secondary and ter-tiary folds in the oviduct infundibulum and ampulla.
黏膜層形成大小不等的初級縱行皺褶。
