囊胚腔

例句：

1. 1. The embryonic development of the human being is divided into three stages: cleavage, gastrulation, and blastocyst formation.
   人类胚胎发育分为三个阶段：裂体、原肠形成和囊胚形成。
2. 2. In this stage, the primitive streak cells begin to divide and form the neural plate, which will eventually become the brain and spinal cord.
   在这一阶段，原始的中线细胞开始分裂并形成神经板，这将最终成为大脑和脊髓。
3. 3. The blastocyst cavity is filled with fluid that will eventually develop into the fetus.
   囊胚腔被充满液体，这些液体将最终发育成胎儿。