preembryo造句

例句与造句

1. Even after implantation begins, a preembryo ( and proembryo ) may exist up until formation of the primitive streak.
2. This more recent meaning is synonymous with " preembryo " or " pre-embryo, " and corresponds to stages with more accepted terms zygote and blastocyst.
3. Use of the terms preembryo and proembryo, in the context of human development, has drawn criticism from opponents of embryo research, and from scientists who have considered this categorization invalid or unnecessary.
4. It's difficult to find preembryo in a sentence. 用preembryo造句挺难的