1) embryonic stage!
胚期
2) blastocyst stage
囊胚期
1.
The speed of development of in vitro fertilized bovine oocytes to the blastocyst stage markedly decreased after ageing in vitro maturation.
体外成熟培养的牛老化卵受精后发育到囊胚期速度减慢。
3) Blastula embryo
囊胚期胚胎
补充资料：海胆的发育原肠胚期
[图]
说明：补充资料仅用于学习参考，请勿用于其它任何用途。