An eight-week-old embryo is only an inch long.
一个8周大的胎儿仅1英寸长。
The sex of the embryo is predetermined at fertilization.
胚胎的性别早在受精时就决定了。
The mother provides the embryo with nourishment and a place to grow.
母亲为胎儿提供营养和一个生长的地方。
A salamander embryo can attract algae inside its tissues and cells.
蝾螈胚胎却会吸引藻类进入组织和细胞。
The pause of the development of an embryo has more benefits for preparing it to avoid the harsh times than for competing with its siblings.
暂停胚胎的发育比与其兄弟姐妹竞争更有利于使它做好准备以避免艰难时期的到来。
This allows her to freeze the development of an embryo during times of drought and food shortage until the offspring in the pouch is able to leave.
这使她能够在干旱和食物短缺时暂缓胚胎的发育，直到育儿袋里的后代能够独立生活。
This led them to believe that the cells in the early embryo are undetermined in the sense that each cell has the potential to develop in a variety of different ways.
这使他们相信早期胚胎中的细胞是不确定的，因为每个细胞都有可能以各种不同的方式发育。
Among other benefits, this allows her to freeze the development of an embryo during times of drought and food shortage until the offspring in the pouch is able to leave.
在其他好处中，这使她能够在干旱和食物短缺时期冻结胚胎的发育，直到育儿袋中的后代有能力自己离开。
Nearly a century ago, biologists found that if they separated an invertebrate animal embryo into two parts at an early stage of its life, it would survive and develop as two normal embryos.
近一个世纪前，生物学家发现，如果他们在无脊椎动物胚胎生命的早期阶段将其分成两部分，它会存活下来并发育成两个正常的胚胎。
The idea already existed in embryo in his earlier novels.
这个想法在他早期的小说中已初见端倪。
The chick embryo proper comes from a very small region resting on the yolk.
小鸡胚胎本身来自于蛋黄上的一个非常小的区域。
Useable embryo recovery was significantly low in ewes of corpora lutea degradation.
在黄体降解的母羊中，可用的胚胎恢复率非常低。
PGC from genital ridge and mesenterium of human embryo was incubated on fibroblast feeder layers for subculture.
从人胚胎生殖嵴、肠系膜中消化分离的原始生殖细胞，将其接种在人子宫内膜成纤维细胞饲养层上传代培养。
他所用的是小鸡胚胎。
During development of an embryo, cells proliferate and organs grow.
在胚胎发育过程中，细胞会发生增殖，然后器官形成。
The technique essentially reverts mature cells to an embryo-like state.
这项研究其实就是将成熟的细胞返祖，变成类似于胚胎状态的细胞。
They do this so they can select the healthiest embryo for transplantation.
他们这样做是为了挑选最健康的胚胎用于移植。
But the risks of human embryo mapping are too great to even consider performing it.
不过人体胚胎成像的风险巨大，付诸实施根本不容考虑。
But this study is the first to show that the algae actually inhabit the embryo itself.
但是这个研究第一次揭示了藻类确实在胚胎内生活。
But they are difficult to make and require the use of an embryo or cloning technology.
但是制造他们是很困难的，而且需要使用胚胎或者是克隆技术。
Unlike embryonic cell cells, cord blood cells do not involve the destruction of an embryo.
与采集胚胎细胞不同，采集脐血细胞不会破坏胚胎。
In the embryo stage, chickens actually have a tail, which disappears before the bird hatches.
事实上小鸡在胚胎期是有长尾的，不过在孵化之前就消失了。
A virus was used to introduce the genes to mouse embryo skin cells, which were then monitored.
他们用一种病毒来把这些基因引入老鼠胚胎的皮肤细胞，然后进行监测。
The embryo that can maintain it obviously has good genes (and also a certain amount of luck).
而能够保持对称的胚胎很显然有较好的基因（当然也是要某些运气的成分）。
How the simple symmetry and its breaking evolves during the growth of the embryo is intriguing.
在胚胎发育过程中这种简单对称和变异是如何演化的，这是个很引人入胜的问题。
Normally, the neural crest cells crawl through the embryo and form a strip running along the back.
通常情况下，神经嵴细胞会爬过整个胚胎并形成一条横贯背部的窄带。
That's because most embryo fossils preserve only the outline of the animal, with nothing inside.
这是因为大部分胚胎化石只保存了动物的空壳，里面一无所有。
The process took three days, after which he photographed the embryo through a stereo microscope.
整个过程持续了3天，之后他通过立体显微镜拍摄照片。
Most notably by the end of this week your baby will no longer be an embryo but will be considered a fetus.
这周末你的婴儿很明显已经不再是一个胚胎了，可以被看作胎儿了。
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