holoentoblastia

例句：

1. 1.Holoentoblastia is a term used to describe the entire layer of cells that make up the embryo.
   全胚层是描述构成胚胎的整个细胞层的术语。
2. 2.In development, the primitive streak is a line of cells that marks the beginning of the neural tube in the early embryo.
   在发育过程中，原始脊线是一条标记着早期胚胎神经管开始的细胞线。
3. 3. The study of holoentoblastia has led to new insights into the development of the nervous system.
   对全胚层的研究为神经系统的发展提供了新的洞见。