胚胎学：研究胚胎和胎儿的形成和发育的学科。
Study of the formation and development of an embryo and fetus.
胚胎学：研究胚胎和胎儿的形成和发育的学科。
To cause the expulsion of(an embryo or fetus)before it is viable.
胎儿皮脂在婴儿的皮肤上形成，以保护其免受水环境的伤害。
Vernix caseosa has formed over the baby’s skin to protect it from its watery environment.
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