periblastula

例句：

1. 1.The plant is in the process of developing its periblastula stage.
   植物正处于发育其幼苗阶段。
2. 2. The scientist observed the growth of the periblastula from the seeds.
   科学家观察了种子从幼苗生长的过程。
3. 3.The young tree is still in the periblastula stage and needs more care.
   这棵年轻的树仍处于幼苗阶段，需要更多的照顾。