Cnidarians grow from embryos that have only two layers of cells .
刺胞动物是由只有两层细胞的晶胚发展而来的。
Some researchers are exploring whether such treatments could be done without destroying embryos .
一些研究人员正在探索这种治疗方法是否能做到不破坏胚胎。
The protein seems to be especially active while human embryos are developing .
这写蛋白质在人类胚胎发育的时候似乎尤其活跃。
Other scientists are using the technique to see whether it can distinguish between healthy and abnormal embryos produced in ivf clinics .
其他科学家也用这种方法,来检测他们是否能区分诊所制造的试管晶胚中,哪些是健康的,哪些是异常的。
Suleman contends that all six embryos were necessary due to her particular condition , and in this instance two of those embryos divided into identical twins .
suleman则声称,由于她的特殊情况,6个晶胚是必需的,这次刚好其中两个分裂成了两对同卵双生子。
Have you ever looked at pictures of embryos ?
你有没有看过胎儿的照片?
The embryos are passed through the cervix into the uterus with a syringe .
利用针筒将胎儿经过子宫颈进入子宫.
The authors said animal studies also found male offspring are more common in times of plenty ; they speculated that higher glucose levels in mothers may favor the survival of male embryos , which are slightly heavier than females .