Many people object to experimentation on embryos.
许多人反对用胚胎做实验。
There are 24,000 frozen embryos in clinics across the country.
全国各地的诊所里有24000个冷冻胚胎。
Early embryos of many species develop ancestral features.
许多物种的早期胚胎具有其祖先的特性。
But it is active only in embryos.
可是它仅仅在晶胚中才具有活性。
So how might the algae enter the embryos?
那么水藻到底是如何进入胚胎里的呢？
Healthy embryos grow into foetuses.
健康的胚胎发育成胎儿。
However, all human embryos initially have a tail.
不过，所有的人类胚胎最初都有一根尾巴。
Most embryos created this way do not survive.
大部分以这种方式形成的胚胎都无法成活。
Or may they create embryos specifically to experiment on?
第二句个人倾向于翻译为：他们可以创造出试验所专用的的胚胎吗？
Transplantation of 2 call embryos is the reasonable choice.
冻融周期移植2个胚胎是合理的选择。
The embryos are quite advanced in their physical development;
那些胚胎已经发育得相当完整了。
Unfortunately, a battle over the control of the embryos begins.
不幸的是，一场争夺胚胎的战斗开始了。
A likely moment occurs as the embryos' nervous systems begin to form.
有可能是在胚胎的神经系统开始形成的时候。
But such experiments destroy human embryos, so right-to-lifers object.
但是这种试验破坏人类胚胎，因此保护胎儿生存权利运动者反对。
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。
Then they labeled cells in even earlier embryos to track where they wound up.
他们还对更早期的胚胎细胞进行标记跟踪，以确定移植的细胞如何愈合。
That is what embryos look like when they are between five and seven days old.
这就是胚胎5到7天大的时候的样子。
Those embryos are each smaller than the period at the end of this sentence.
这些胚胎比这句话后面的句点还要小。
The only difference is at the chromosomal level, deep inside the embryos' cells.
唯一的区别在于染色体的水平，它埋藏在胚胎细胞的深处。
Objective To observe the growth and implantation of mouse embryos in vitro.
目的观察小鼠胚胎的体外发育及种植过程。
You may also wish to consider reducing the number of embryos you are carrying.
你可能也要考虑减少你怀孕的胚胎数目。
Objective To isolate and culture mouse embryonic stem cell from embryos of mouse.
目的从大鼠的早期胚胎分离和培养胚胎干细胞。
Note: The number in bracket was the percent of the total number of somatic embryos.
括号内数字为占体细胞胚总数的百分数。
Preimplantation development of reconstructed embryos by nuclear transfer was studied.
小鼠体细胞核移植重构胚的着床前发育情况。
Theoretically, of course, people might only create as many embryos as they plan to implant.
毋庸置疑，从理论上看，人们只有想植入多少胚胎才能制造多少胚胎。
Theoretically, of course, people might only create as many embryos as they plan to implant.
毋庸置疑，从理论上看，人们只有想植入多少胚胎才能制造多少胚胎。
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