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(胎儿)发育是遗传信息和环境因素相互作用的编程过程。
The development of embryo and fetus is a programmed process by which one's genotype interacts with the environment to produce its phenotype.
在胚胎发育期，胎儿通过新血管化过程(其内皮细胞源于祖细胞)和新生血管形成过程(新血管由旧血管芽生而来)生成毛细血管。
During embryogenesis, capillaries develop in the fetus by neovascularization, where endothelial cells arise from progenitor cells; and angiogenesis, in which new blood vessels sprout from old ones.
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.
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.
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