1.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.
胎发育经过二细胞原、多细胞原、球形原、梨形原、
和
熟
。
明：以上例句、词性
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