During fetal development, the entire body derives from three layers, called germ layers, the ectoderm, mesoderm, and endoderm.

胚胎发育过程三个胚层组成，分别是：外胚层、中胚层与内胚层。

With the exception of jellyfish, all animals today are triploblastic.

除了水母以外，今天所有的动物都是三胚层的。

All the Ediacaran creatures were diploblastic, meaning they were built from two layers of tissue.

埃迪亚卡拉动物都是双胚层的，即它层组织构成。

The jellyfish absorbs oxygen through its ectoderm and can store it in the mesoglea.

水母通过外胚层吸收氧气，并将其储存在中胶层中。

The other type are immature teratomas, and they develop specifically from neuroectoderm cells - which come from the ectoderm layer.

二种是未成熟畸胎瘤，专门神经外胚层细胞发育而来，来自外胚层。

The layer of cells, the endoderm, is thin, like the ectoderm, allowing nutrients to be directly absorbed into the surrounding cells.

细胞的内胚层很薄，像外胚层一样，可以让营养物质直接的细胞吸收。

Ewing sarcoma is thought to arise from neuroectodermal cells, and which look like small, round, blue cells on microscopy.

尤因肉瘤认为源于神经外胚层细胞；它在显微镜下呈现为小的、圆形的蓝色细胞。

Under the microscope, they form Schiller-Duval bodies which are rings of cells around a central blood vessel.

显微镜下，他形成Schiller-Duval小体，即恶性内胚层细胞绕血管呈放射状排列。

Human cells in the chimera's epiblast behaved more like those found in human embryos than those found in monkey embryos.

嵌合体外胚层中的人类细胞的行为更近似于人类胚胎细胞，而不像猴子胚胎细胞。

But that was not true of human hypoblast or extra-embryonic mesenchyme cells, both of which behaved more like monkey cells.

但内胚层或胚外间充质细胞中的人类细胞的行为却都更像猴子细胞。

The first category we're going to look at is the ectomorph.

我要看的第一个类别是外胚层。

Second major category we're going to look at is the mesomorph, also known as Somatotonic.

我要看的第二个主要类别是中胚层，也称为 Somatotonic。

This protein causes defects in the differentiation process of human mesenchymal stem cell and neuroectodermal cells, resulting in Ewing sarcoma tumor cells.

该蛋白在间充质干细胞、神经外胚层细胞分化过程中引起缺陷，产生尤因肉瘤肿瘤细胞。

The jellyfish's outer layer of cells, called the ECTODERM, is so thin that oxygen dissolved in the water can simply diffuse right through it.

水母的外胚层细胞非常薄，溶解在水中的氧气可以直接穿过它。

No more than 7% of the epiblast was made up of human cells, and just 5% of the hypoblast (in other areas the numbers were lower still).

人类细胞在外胚层中的占比不超过7％，在内胚层只有5％（在另类中占比还要少）。

The second subtype is a yolk sac tumor, also called an endodermal sinus tumor, and it's made of germ cells that differentiate into yolk sac tissue.

第二种亚型是卵黄囊瘤，也称为内胚层窦瘤，是分化为卵黄囊的生殖细胞组成。

Very early on in fetal development, the ectoderm which is the outer layer of the fertilized egg starts to develop a bit of a ridge that eventually becomes the neural tube.

在胎儿发育的早期，受精卵的外层，即外胚层，开始形成脊状突起，最后形成神经管。

For example, I find that I usually can fit into the mesomorph category a little bit easier as I can put on muscle and keep that off fairly easily.

例如，我发现我通常更容易适应中胚层类别， 因为我可以很容易地锻炼肌肉并保持肌肉发达。

Mature cystic teratomas are the most common ovarian tumors in young women and usually contain a heterogeneous mix of mature tissues that come from two or three of the germ cell layers.

成熟囊性畸胎瘤是年轻女性中最常见的卵巢肿瘤，内容物常为多种成熟组织的混合物，分别个或三个胚层的生殖细胞分化而来。

This constitutes a defect or absence of the vertebral arches, due to failure of mesoderm to organize over the region of the defect, and it may or may not involve the underlying meninges and neural tissue.

这导致了椎弓的畸形或缺失，这是于中胚层不能在缺陷区域处生长；椎弓的缺失可能影响其下的脑脊膜和神经组织。