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The primitie mouth, or stomodeum, is a slight depression on the surface of the ectoderm.

原始的口(或口胚层表面的一个轻微的

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Bilateral oal thickenings of the surface ectoderm, called nasal placodes, then deelop on each side of the inferior part of the frontonasal prominence.

胚层表面呈双边卵圆成鼻板,然后发展成为额鼻隆起的下半部分。

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科学大揭秘

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

水母通过吸收氧气,并将其储存在中胶中。

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Osmosis-生

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

胎发育过程由三个组成,分别是:、中与内

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Osmosis-生

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,专由神经细胞发育而来,来自

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科学大揭秘

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

细胞的内很薄,像一样,可以让营养物质直接被周围的细胞吸收。

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科学大揭秘

The jellyfish body is mainly composed of mesoglea, a jelly-like fluid sandwich between the outer ectoderm and the inner digestive cavity the endoderm.

水母的身体主要由中间胶质组成,中间胶质是一种果冻状的液体,夹在膜和内消化腔内膜之间。

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科学大揭秘

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.

水母的细胞非常薄,溶解在水中的氧气可以直接穿过它。

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Osmosis-神经

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,即,开始形成脊状突起,最后形成神经管。

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