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。
Study on the degree of fracture development in fractured formation is very important.
裂缝发育程度在裂缝性地层的研究中非常重要。
Heart tube formation is one of the most important events in the early heart development.
心管的发生是心脏发育早期最重要的事件之一。
Study of the formation and development of an embryo and fetus.
胎儿的：有关胎儿的、有胎儿特点的或是胎儿的。
Study of the formation and development of an embryo and fetus.
胎儿的：有关胎儿的、有胎儿特点的或是胎儿的。
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