globular

There are 5 stages during the development of embryo, including the stage of 2-celled proembryo, multicellular proembryo, globular proembryo, pyriform proembryo, differential embryo and mature embryo.

胎发育经过二细胞、多细胞、形、梨形、分化和成熟阶段。

We also describe the basic principle of white dwarf cosmochronology and its application in defining the age of the Galactic disk, globular clusters, open clusters and Galactic halo.

介绍了白矮星宇宙纪年学研究基本理及其在银盘、状星团、疏散星团以及银晕年龄确定方面应用现状。